{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33916", "tracking": { "current_release_date": "2026-03-31T18:28:04.563525Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33916", "initial_release_date": "2026-03-26T22:54:44.997128Z", "revision_history": [ { "date": "2026-03-26T22:54:44.997128Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (6).| CWES updated (1)." }, { "date": "2026-03-26T22:54:50.708949Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-27T00:20:51.198648Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (5).| CWES updated (1)." }, { "date": "2026-03-27T00:20:53.237601Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-27T07:34:56.686996Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:38:09.463260Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-28T07:38:11.424466Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:40:44.824544Z", "number": "8", "summary": "References created (1)." }, { "date": "2026-03-28T07:40:51.578512Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-28T07:40:54.096579Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-28T12:28:06.098048Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (31).| Product Identifiers created (10).| Product Remediations created (31).| References created (5).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-28T12:28:20.179510Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-28T12:44:12.675536Z", "number": "13", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (2)." }, { "date": "2026-03-28T12:44:18.580647Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-29T00:38:34.928431Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-30T16:39:14.104319Z", "number": "16", "summary": "Unknown change." }, { "date": "2026-03-30T16:39:15.391205Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-31T12:19:59.068410Z", "number": "18", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| CWES updated (1)." }, { "date": "2026-03-31T12:20:01.455847Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-03-31T18:25:13.751084Z", "number": "20", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-31T18:25:16.958036Z", "number": "21", "summary": "NCSC Score updated." } ], "status": "interim", "version": "21" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2524215" } } ], "category": "product_name", "name": "389-ds-base" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459357" } } ], "category": "product_name", "name": "firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1663145" } } ], "category": "product_name", "name": "grafana" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2631284" } } ], "category": "product_name", "name": "mozjs60" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459358" } } ], "category": "product_name", "name": "thunderbird" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/4", "product": { "name": "vers:rpm/4", "product_id": "CSAFPID-2552001", "product_identification_helper": { "cpe": "cpe:/a:redhat:cryostat:4" } } } ], "category": "product_name", "name": "Cryostat 4" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/5", "product": { "name": "vers:rpm/5", "product_id": "CSAFPID-1459353", "product_identification_helper": { "cpe": "cpe:/a:redhat:logging:5" } } } ], "category": "product_name", "name": "Logging Subsystem for Red Hat OpenShift" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439292", "product_identification_helper": { "cpe": "cpe:/a:redhat:jboss_data_grid:8" } } } ], "category": "product_name", "name": "Red Hat Data Grid 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/10", "product": { "name": "vers:rpm/10", "product_id": "CSAFPID-2858634", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439315", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:7" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1439319", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:9" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439279", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_ai" } } } ], "category": "product_name", "name": "Red Hat OpenShift AI (RHOAI)" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/3", "product": { "name": "vers:rpm/3", "product_id": "CSAFPID-1441150", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_devspaces:3:" } } } ], "category": "product_name", "name": "Red Hat OpenShift Dev Spaces" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439306", "product_identification_helper": { "cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7" } } } ], "category": "product_name", "name": "Red Hat Process Automation 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2467450" } } ], "category": "product_name", "name": "code-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift Dev Spaces" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5187689" } } ], "category": "product_name", "name": "elasticsearch-operator-bundle" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2914696" } } ], "category": "product_name", "name": "elasticsearch-proxy-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2914697" } } ], "category": "product_name", "name": "elasticsearch-rhel9-operator" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2855724" } } ], "category": "product_name", "name": "elasticsearch6-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459355" } } ], "category": "product_name", "name": "kibana6-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2855725" } } ], "category": "product_name", "name": "logging-curator5-rhel9" } ], "category": "product_family", "name": "Logging Subsystem for Red Hat OpenShift" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2873478" } } ], "category": "product_name", "name": "firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2876286" } } ], "category": "product_name", "name": "thunderbird" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459356" } } ], "category": "product_name", "name": "firefox" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459360" } } ], "category": "product_name", "name": "firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459361" } } ], "category": "product_name", "name": "thunderbird" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5958193" } } ], "category": "product_name", "name": "handlebars" } ], "category": "product_family", "name": "Cryostat 4" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5958194" } } ], "category": "product_name", "name": "handlebars" } ], "category": "product_family", "name": "Red Hat Data Grid 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5958195" } } ], "category": "product_name", "name": "handlebars" } ], "category": "product_family", "name": "Red Hat Process Automation 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5068114" } } ], "category": "product_name", "name": "odh-workbench-codeserver-datascience-cpu-py312-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift AI (RHOAI)" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=4.0.0|<4.7.9", "product": { "name": "vers:unknown/>=4.0.0|<4.7.9", "product_id": "CSAFPID-5969389", "product_identification_helper": { "cpe": "cpe:2.3:a:handlebarsjs:handlebars:*:*:*:*:*:node.js:*:*" } } } ], "category": "product_name", "name": "Handlebars" } ], "category": "vendor", "name": "Handlebarsjs" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5733329", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:cbl2_reaper_3.1.1-22:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "cbl2 reaper 3.1.1-22 on CBL Mariner 2.0" } ], "category": "product_family", "name": "Open Source Software" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=4.0.0|<4.7.9", "product": { "name": "vers:unknown/>=4.0.0|<4.7.9", "product_id": "CSAFPID-5920252" } } ], "category": "product_name", "name": "handlebars" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=4.0.0|<4.7.9", "product": { "name": "vers:unknown/>=4.0.0|<4.7.9", "product_id": "CSAFPID-5956278" } } ], "category": "product_name", "name": "handlebars.js" } ], "category": "vendor", "name": "handlebars-lang" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5958362" } } ], "category": "product_name", "name": "node-handlebars" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5958363" } } ], "category": "product_name", "name": "node-handlebars" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33916", "cwe": { "id": "CWE-1321", "name": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')" }, "notes": [ { "category": "description", "text": "## Summary\n\n`resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered **without HTML escaping**, resulting in reflected or stored XSS.\n\n## Description\n\nThe root cause is in `lib/handlebars/runtime.js` inside `resolvePartial()` and `invokePartial()`:\n\n```javascript\n// Vulnerable: plain bracket access traverses Object.prototype\npartial = options.partials[options.name];\n```\n\n`hasOwnProperty` is never checked, so if `Object.prototype` has been seeded with a key whose name matches a partial reference in the template (e.g. `widget`), the lookup succeeds and the polluted string is returned. The runtime emits a prototype-access warning, but the partial is still resolved and its content is inserted into the rendered output unescaped. This contradicts the documented security model and is distinct from CVE-2021-23369 and CVE-2021-23383, which addressed data property access rather than partial template resolution.\n\n**Prerequisites for exploitation:**\n1. The target application must be vulnerable to prototype pollution (e.g. via `qs`, `minimist`, or\n any querystring/JSON merge sink).\n2. The attacker must know or guess the name of a partial reference used in a template.\n\n## Proof of Concept\n\n```javascript\nconst Handlebars = require('handlebars');\n\n// Step 1: Prototype pollution (via qs, minimist, or another vector)\nObject.prototype.widget = '';\n\n// Step 2: Normal template that references a partial\nconst template = Handlebars.compile('
Welcome! {{> widget}}
');\n\n// Step 3: Render — XSS payload injected unescaped\nconst output = template({});\n// Output:
Welcome!
\n```\n\n> The runtime prints a prototype access warning claiming \"access has been denied,\" but the partial still resolves and returns the polluted value.\n\n## Workarounds\n\n- Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries.\n- Use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.", "title": "github - https://api.github.com/advisories/GHSA-2qvq-rjwj-gvw9" }, { "category": "description", "text": "## Summary\n\n`resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered **without HTML escaping**, resulting in reflected or stored XSS.\n\n## Description\n\nThe root cause is in `lib/handlebars/runtime.js` inside `resolvePartial()` and `invokePartial()`:\n\n```javascript\n// Vulnerable: plain bracket access traverses Object.prototype\npartial = options.partials[options.name];\n```\n\n`hasOwnProperty` is never checked, so if `Object.prototype` has been seeded with a key whose name matches a partial reference in the template (e.g. `widget`), the lookup succeeds and the polluted string is returned. The runtime emits a prototype-access warning, but the partial is still resolved and its content is inserted into the rendered output unescaped. This contradicts the documented security model and is distinct from CVE-2021-23369 and CVE-2021-23383, which addressed data property access rather than partial template resolution.\n\n**Prerequisites for exploitation:**\n1. The target application must be vulnerable to prototype pollution (e.g. via `qs`, `minimist`, or\n any querystring/JSON merge sink).\n2. The attacker must know or guess the name of a partial reference used in a template.\n\n## Proof of Concept\n\n```javascript\nconst Handlebars = require('handlebars');\n\n// Step 1: Prototype pollution (via qs, minimist, or another vector)\nObject.prototype.widget = '';\n\n// Step 2: Normal template that references a partial\nconst template = Handlebars.compile('
Welcome! {{> widget}}
');\n\n// Step 3: Render — XSS payload injected unescaped\nconst output = template({});\n// Output:
Welcome!
\n```\n\n> The runtime prints a prototype access warning claiming \"access has been denied,\" but the partial still resolves and returns the polluted value.\n\n## Workarounds\n\n- Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries.\n- Use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-2qvq-rjwj-gvw9.json?alt=media" }, { "category": "description", "text": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33916" }, { "category": "description", "text": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33916.json" }, { "category": "description", "text": "A flaw was found in Handlebars. The `resolvePartial()` function in the Handlebars runtime does not properly guard against prototype-chain traversal when resolving partial names. This allows an attacker to inject malicious code into web pages. When `Object.prototype` has been polluted with a string value that matches a partial reference, the polluted string is used as the partial body and rendered without proper HTML escaping. This can result in reflected or stored Cross-Site Scripting (XSS), potentially leading to arbitrary code execution in a user's browser or information disclosure.\nModerate: This vulnerability in Handlebars allows for Cross-Site Scripting (XSS) when an application uses Handlebars versions 4.0.0 through 4.7.8 and is susceptible to prototype pollution. An attacker could inject malicious code into web pages, potentially leading to arbitrary code execution in a user's browser or information disclosure. This affects Red Hat products that embed or utilize vulnerable versions of the Handlebars library.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33916.json" }, { "category": "description", "text": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33916" }, { "category": "description", "text": "Handlebars.js has Prototype Pollution Leading to XSS through Partial Template Injection", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "other", "text": "0.00029", "title": "EPSS" }, { "category": "other", "text": "3.9", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is exploit data available from source Nvd, Is related to a product by vendor Red Hat", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5920252", "CSAFPID-5956278", "CSAFPID-1439279", "CSAFPID-1439292", "CSAFPID-1439306", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1441150", "CSAFPID-1459353", "CSAFPID-1459355", "CSAFPID-1459356", "CSAFPID-1459357", "CSAFPID-1459358", "CSAFPID-1459360", "CSAFPID-1459361", "CSAFPID-1663145", "CSAFPID-2467450", "CSAFPID-2524215", "CSAFPID-2552001", "CSAFPID-2631284", "CSAFPID-2855724", "CSAFPID-2855725", "CSAFPID-2858634", "CSAFPID-2873478", "CSAFPID-2876286", "CSAFPID-2914696", "CSAFPID-2914697", "CSAFPID-5068114", "CSAFPID-5187689", "CSAFPID-5958193", "CSAFPID-5958194", "CSAFPID-5958195", "CSAFPID-5958362", "CSAFPID-5958363", "CSAFPID-5733329", "CSAFPID-5969389" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-2qvq-rjwj-gvw9" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-2qvq-rjwj-gvw9.json?alt=media" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33916" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33916.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33916.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33916" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2qvq-rjwj-gvw9" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23369" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23383" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-2qvq-rjwj-gvw9" }, { "category": "external", "summary": "Reference - github; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33916" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33916" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this issue, apply `Object.freeze(Object.prototype)` early in the application startup to prevent prototype pollution. Alternatively, use the Handlebars runtime-only build (`handlebars/runtime`), which reduces the attack surface by not compiling templates. Be aware that applying `Object.freeze(Object.prototype)` may impact the functionality of other libraries within the application. Applications utilizing Handlebars may require a restart for these changes to take effect.", "product_ids": [ "CSAFPID-1439279", "CSAFPID-1439292", "CSAFPID-1439306", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1441150", "CSAFPID-1459353", "CSAFPID-1459355", "CSAFPID-1459356", "CSAFPID-1459357", "CSAFPID-1459358", "CSAFPID-1459360", "CSAFPID-1459361", "CSAFPID-1663145", "CSAFPID-2467450", "CSAFPID-2524215", "CSAFPID-2552001", "CSAFPID-2631284", "CSAFPID-2855724", "CSAFPID-2855725", "CSAFPID-2858634", "CSAFPID-2873478", "CSAFPID-2876286", "CSAFPID-2914696", "CSAFPID-2914697", "CSAFPID-5068114", "CSAFPID-5187689", "CSAFPID-5958193", "CSAFPID-5958194", "CSAFPID-5958195" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.7, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1439279", "CSAFPID-1439292", "CSAFPID-1439306", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1441150", "CSAFPID-1459353", "CSAFPID-1459355", "CSAFPID-1459356", "CSAFPID-1459357", "CSAFPID-1459358", "CSAFPID-1459360", "CSAFPID-1459361", "CSAFPID-1663145", "CSAFPID-2467450", "CSAFPID-2524215", "CSAFPID-2552001", "CSAFPID-2631284", "CSAFPID-2855724", "CSAFPID-2855725", "CSAFPID-2858634", "CSAFPID-2873478", "CSAFPID-2876286", "CSAFPID-2914696", "CSAFPID-2914697", "CSAFPID-5068114", "CSAFPID-5187689", "CSAFPID-5733329", "CSAFPID-5920252", "CSAFPID-5956278", "CSAFPID-5958193", "CSAFPID-5958194", "CSAFPID-5958195", "CSAFPID-5958362", "CSAFPID-5958363", "CSAFPID-5969389" ] } ], "title": "CVE-2026-33916" } ] }