{ "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-2026-33939", "tracking": { "current_release_date": "2026-03-31T18:25:34.458338Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33939", "initial_release_date": "2026-03-27T20:28:33.349954Z", "revision_history": [ { "date": "2026-03-27T20:28:33.349954Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-27T20:28:42.205972Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-28T07:38:51.469113Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-28T07:39:00.792600Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:39:58.776399Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-28T07:40:01.442611Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:43:25.480599Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-28T12:27:58.170591Z", "number": "8", "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": "2026-03-28T12:28:08.508341Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-28T12:44:14.041033Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)." }, { "date": "2026-03-28T12:44:18.580647Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-29T00:38:31.863020Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-30T19:38:55.658512Z", "number": "13", "summary": "Unknown change." }, { "date": "2026-03-30T19:39:02.215570Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-30T20:47:09.356886Z", "number": "15", "summary": "References created (1)." }, { "date": "2026-03-31T12:19:53.242555Z", "number": "16", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| CWES updated (1)." }, { "date": "2026-03-31T12:19:55.547087Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-31T18:25:30.773688Z", "number": "18", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-31T18:25:32.495970Z", "number": "19", "summary": "NCSC Score updated." } ], "status": "interim", "version": "19" } }, "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-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-2026-33939", "cwe": { "id": "CWE-754", "name": "Improper Check for Unusual or Exceptional Conditions" }, "notes": [ { "category": "description", "text": "## Summary\n\nWhen a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. `{{*n}}`), the compiled template calls `lookupProperty(decorators, \"n\")`, which returns `undefined`. The runtime then immediately invokes the result as a function, causing an unhandled `TypeError: ... is not a function` that crashes the Node.js process. Any application that compiles user-supplied templates without wrapping the call in a `try/catch` is vulnerable to a single-request Denial of Service.\n\n## Description\n\nIn `lib/handlebars/compiler/javascript-compiler.js`, the code generated for a decorator invocation looks like:\n\n```javascript\nfn = lookupProperty(decorators, \"n\")(fn, props, container, options) || fn;\n```\n\nWhen `\"n\"` is not a registered decorator, `lookupProperty(decorators, \"n\")` returns `undefined`. The expression immediately attempts to call `undefined` as a function, producing:\n\n```\nTypeError: lookupProperty(...) is not a function\n```\n\nBecause the error is thrown inside the compiled template function and is not caught by the runtime, it propagates up as an unhandled exception and — when not caught by the application — crashes the Node.js process.\n\nThis inconsistency is notable: references to unregistered **helpers** produce a clean `\"Missing helper: ...\"` error, while references to unregistered **decorators** cause a hard crash.\n\n**Attack scenario:** An attacker submits `{{*n}}` as template content to any endpoint that calls `Handlebars.compile(userInput)()`. Each request crashes the server process; with process managers that auto-restart (PM2, systemd), repeated submissions create a persistent DoS.\n\n## Proof of Concept\n\n```javascript\nconst Handlebars = require('handlebars'); // Handlebars 4.7.8, Node.js v22.x\n\n// Any of these payloads crash the process\nHandlebars.compile('{{*n}}')({});\nHandlebars.compile('{{*decorator}}')({});\nHandlebars.compile('{{*constructor}}')({});\n```\n\nExpected crash output:\n```\nTypeError: lookupProperty(...) is not a function\n at Function.eval [as decorator] (eval at compile (...javascript-compiler.js:134:36))\n```\n\n## Workarounds\n\n- **Wrap compilation and rendering in `try/catch`:**\n ```javascript\n try {\n const result = Handlebars.compile(userInput)(context);\n res.send(result);\n } catch (err) {\n res.status(400).send('Invalid template');\n }\n ```\n- **Validate template input** before passing it to `compile()`. Reject templates containing decorator syntax (`{{*...}}`) if decorators are not used in your application.\n- **Use the pre-compilation workflow:** compile templates at build time and serve only pre-compiled templates; do not call `compile()` at request time.", "title": "github - https://api.github.com/advisories/GHSA-9cx6-37pm-9jff" }, { "category": "description", "text": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. `{{*n}}`), the compiled template calls `lookupProperty(decorators, \"n\")`, which returns `undefined`. The runtime then immediately invokes the result as a function, causing an unhandled `TypeError: ... is not a function` that crashes the Node.js process. Any application that compiles user-supplied templates without wrapping the call in a `try/catch` is vulnerable to a single-request Denial of Service. Version 4.7.9 fixes the issue. Some workarounds are available. Wrap compilation and rendering in `try/catch`. Validate template input before passing it to `compile()`; reject templates containing decorator syntax (`{{*...}}`) if decorators are not used in your application. Use the pre-compilation workflow; compile templates at build time and serve only pre-compiled templates; do not call `compile()` at request time.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33939.json" }, { "category": "description", "text": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. `{{*n}}`), the compiled template calls `lookupProperty(decorators, \"n\")`, which returns `undefined`. The runtime then immediately invokes the result as a function, causing an unhandled `TypeError: ... is not a function` that crashes the Node.js process. Any application that compiles user-supplied templates without wrapping the call in a `try/catch` is vulnerable to a single-request Denial of Service. Version 4.7.9 fixes the issue. Some workarounds are available. Wrap compilation and rendering in `try/catch`. Validate template input before passing it to `compile()`; reject templates containing decorator syntax (`{{*...}}`) if decorators are not used in your application. Use the pre-compilation workflow; compile templates at build time and serve only pre-compiled templates; do not call `compile()` at request time.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33939" }, { "category": "description", "text": "A flaw was found in Handlebars.js. A remote attacker can exploit this by submitting a malformed Handlebars template that includes decorator syntax referencing an unregistered decorator. When the application attempts to compile this template without proper error handling, it triggers an unhandled `TypeError`. This error causes the Node.js process to crash, resulting in a Denial of Service (DoS) for the affected application.\nThis is an Important denial of service flaw in Handlebars.js affecting applications that compile user-supplied templates without proper error handling. A remote attacker can submit a malformed template containing unregistered decorator syntax, leading to an unhandled `TypeError` and crashing the Node.js process. Red Hat products are vulnerable if they use Handlebars.js in a configuration that allows untrusted input to be compiled at runtime without implementing `try/catch` blocks or input validation.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33939.json" }, { "category": "description", "text": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. `{{*n}}`), the compiled template calls `lookupProperty(decorators, \"n\")`, which returns `undefined`. The runtime then immediately invokes the result as a function, causing an unhandled `TypeError: ... is not a function` that crashes the Node.js process. Any application that compiles user-supplied templates without wrapping the call in a `try/catch` is vulnerable to a single-request Denial of Service. Version 4.7.9 fixes the issue. Some workarounds are available. Wrap compilation and rendering in `try/catch`. Validate template input before passing it to `compile()`; reject templates containing decorator syntax (`{{*...}}`) if decorators are not used in your application. Use the pre-compilation workflow; compile templates at build time and serve only pre-compiled templates; do not call `compile()` at request time.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33939" }, { "category": "description", "text": "Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "other", "text": "0.00038", "title": "EPSS" }, { "category": "other", "text": "3.8", "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: 3\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "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-9cx6-37pm-9jff" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33939.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33939" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33939.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33939" }, { "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; redhat", "url": "https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-9cx6-37pm-9jff" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; redhat", "url": "https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; 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-9cx6-37pm-9jff" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33939" }, { "category": "external", "summary": "Reference - github; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33939" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this issue, applications utilizing Handlebars.js should implement robust error handling during template compilation and rendering. Specifically, wrap template compilation and rendering calls in `try/catch` blocks to gracefully handle `TypeError` exceptions. Alternatively, validate user-supplied template input to reject decorator syntax (`{{*...}}`) if decorators are not actively used by the application. Employing a pre-compilation workflow, where templates are compiled at build time and only pre-compiled templates are served, can also prevent runtime exploitation. If the application is a service, a restart may be required for 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "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-5956278", "CSAFPID-5958193", "CSAFPID-5958194", "CSAFPID-5958195", "CSAFPID-5958362", "CSAFPID-5958363", "CSAFPID-5969389" ] } ], "title": "CVE-2026-33939" } ] }