{ "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-2026-123864", "tracking": { "current_release_date": "2026-11-13T00:30:18.664625Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-123864", "initial_release_date": "2026-11-11T18:38:26.028683Z", "revision_history": [ { "date": "2026-11-11T18:38:26.028683Z", "number": "1", "summary": "CWES created (1).| Products created (3).| References created (2).| Description created for source.| Unknown change." }, { "date": "2026-11-11T18:38:34.698118Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-11-11T19:32:06.971023Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-11-11T19:32:08.965832Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-11-12T00:34:18.230835Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (6).| Product Identifiers created (1).| Product Remediations created (6).| References created (4).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-11-12T00:34:19.615863Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-11-12T02:41:47.574146Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-11-12T06:44:36.155421Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-11-12T06:44:37.139974Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-11-12T12:19:47.855121Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| Products connected (3).| References created (3)." }, { "date": "2026-11-12T12:19:49.501397Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-11-12T14:20:18.929461Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-11-12T15:48:33.757836Z", "number": "13", "summary": "CVSS created.| Products created (4).| References created (1).| Description created for source.| Unknown change." }, { "date": "2026-11-12T15:48:37.076493Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-11-12T16:16:58.498992Z", "number": "15", "summary": "EPSS created.| Unknown change." }, { "date": "2026-11-12T16:19:42.004695Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-11-13T00:03:39.354386Z", "number": "17", "summary": "Products created (2)." }, { "date": "2026-11-13T00:30:07.741519Z", "number": "18", "summary": "NCSC Score updated." } ], "status": "interim", "version": "18" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<22.23.5", "product": { "name": "vers:unknown/<22.23.5", "product_id": "CSAFPID-10088842" } }, { "category": "product_version_range", "name": "vers:unknown/<24.22.3", "product": { "name": "vers:unknown/<24.22.3", "product_id": "CSAFPID-10088840" } }, { "category": "product_version_range", "name": "vers:unknown/<26.13.1", "product": { "name": "vers:unknown/<26.13.1", "product_id": "CSAFPID-10088841" } } ], "category": "product_name", "name": "Node.js" } ], "category": "vendor", "name": "Open Source" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1", "product": { "name": "vers:rpm/1", "product_id": "CSAFPID-6014972", "product_identification_helper": { "cpe": "cpe:/a:redhat:hummingbird:1" } } } ], "category": "product_name", "name": "Red Hat Hardened Images" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-8505503" } } ], "category": "product_name", "name": "nodejs20" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-8505504" } } ], "category": "product_name", "name": "nodejs22" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-8476917" } } ], "category": "product_name", "name": "nodejs24" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-6239276" } } ], "category": "product_name", "name": "nodejs25" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-8476920" } } ], "category": "product_name", "name": "nodejs26" } ], "category": "product_family", "name": "Red Hat Hardened Images" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<9.4.4-r0", "product": { "name": "vers:unknown/>=0|<9.4.4-r0", "product_id": "CSAFPID-10092239" } } ], "category": "product_name", "name": "llhttp" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<24.22.3-r0", "product": { "name": "vers:unknown/>=0|<24.22.3-r0", "product_id": "CSAFPID-10088335" } } ], "category": "product_name", "name": "nodejs" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<26.13.1-r0", "product": { "name": "vers:unknown/>=0|<26.13.1-r0", "product_id": "CSAFPID-10092238" } } ], "category": "product_name", "name": "nodejs-current" } ], "category": "product_family", "name": "Alpine:v3.24" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<22.23.5-r0", "product": { "name": "vers:unknown/>=0|<22.23.5-r0", "product_id": "CSAFPID-10088332" } } ], "category": "product_name", "name": "nodejs" } ], "category": "product_family", "name": "Alpine:v3.21" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<22.23.5-r0", "product": { "name": "vers:unknown/>=0|<22.23.5-r0", "product_id": "CSAFPID-10088333" } } ], "category": "product_name", "name": "nodejs" } ], "category": "product_family", "name": "Alpine:v3.22" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<24.22.3-r0", "product": { "name": "vers:unknown/>=0|<24.22.3-r0", "product_id": "CSAFPID-10088334" } } ], "category": "product_name", "name": "nodejs" } ], "category": "product_family", "name": "Alpine:v3.23" } ], "category": "vendor", "name": "Alpine" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1408881" } } ], "category": "product_name", "name": "nodejs" } ], "category": "product_family", "name": "bookworm" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:semver/0.0.0|<22.23.5", "product": { "name": "vers:semver/0.0.0|<22.23.5", "product_id": "CSAFPID-10084446" } }, { "category": "product_version_range", "name": "vers:semver/23.0.0|<24.22.3", "product": { "name": "vers:semver/23.0.0|<24.22.3", "product_id": "CSAFPID-10084447" } }, { "category": "product_version_range", "name": "vers:semver/25.0.0|<26.13.1", "product": { "name": "vers:semver/25.0.0|<26.13.1", "product_id": "CSAFPID-10084445" } } ], "category": "product_name", "name": "nodejs" } ], "category": "vendor", "name": "nodejs" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-123864", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "A re-entrancy flaw in Node.js HTTPS lets an unauthenticated client read memory belonging to other connections, including TLS private keys and other users' requests. TLSWrap::DoWrite() calls ClearOut() directly when asked to write zero bytes; if that write is issued from JavaScript running inside the HTTP parser's on_body callback, ClearOut() decrypts the next TLS record while the parser is still mid-body, re-entering llhttp_execute() and causing a use-after-free and an out-of-bounds heap read. The server then copies that freed or unrelated heap memory into the response for the request body. Triggering it requires a handler that calls res.flushHeaders() before the request body ends and later calls res.end() with a non-empty chunk, and reading the leaked memory requires any ordinary route that echoes or stores a request body. Cleartext node:http is not affected. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-123864" }, { "category": "description", "text": "A re-entrancy flaw in Node.js HTTPS lets an unauthenticated client read memory belonging to other connections, including TLS private keys and other users' requests. TLSWrap::DoWrite() calls ClearOut() directly when asked to write zero bytes; if that write is issued from JavaScript running inside the HTTP parser's on_body callback, ClearOut() decrypts the next TLS record while the parser is still mid-body, re-entering llhttp_execute() and causing a use-after-free and an out-of-bounds heap read. The server then copies that freed or unrelated heap memory into the response for the request body. Triggering it requires a handler that calls res.flushHeaders() before the request body ends and later calls res.end() with a non-empty chunk, and reading the leaked memory requires any ordinary route that echoes or stores a request body. Cleartext node:http is not affected. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-123864" }, { "category": "description", "text": "A flaw was found in Node.js. An unauthenticated remote attacker can exploit a re-entrancy vulnerability in the HTTPS server to cause memory corruption and read memory belonging to other connections. Under specific request handling conditions, processing incoming encrypted data while the HTTP parser is active causes freed or out-of-bounds heap memory to be read and returned to the client. This flaw leads to information disclosure, potentially exposing sensitive data such as other users' requests and Transport Layer Security (TLS) private keys.\nThis vulnerability is rated as Important rather than Moderate because an unauthenticated remote attacker can trigger heap memory corruption across concurrent sessions, potentially leaking sensitive data such as private cryptographic keys or request payloads belonging to other users. However, successful exploitation requires high attack complexity, as the target application must implement specific streaming and header-flushing behaviors during request body processing. Node.js deployments serving unencrypted HTTP or terminating TLS at an external gateway remain unaffected by this flaw.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-123864" }, { "category": "description", "text": "A re-entrancy flaw in Node.js HTTPS lets an unauthenticated client read memory belonging to other connections, including TLS private keys and other users' requests. TLSWrap::DoWrite() calls ClearOut() directly when asked to write zero bytes; if that write is issued from JavaScript running inside the HTTP parser's on_body callback, ClearOut() decrypts the next TLS record while the parser is still mid-body, re-entering llhttp_execute() and causing a use-after-free and an out-of-bounds heap read. The server then copies that freed or unrelated heap memory into the response for the request body. Triggering it requires a handler that calls res.flushHeaders() before the request body ends and later calls res.end() with a non-empty chunk, and reading the leaked memory requires any ordinary route that echoes or stores a request body. Cleartext node:http is not affected. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-123864" }, { "category": "description", "text": "A re-entrancy flaw in Node.js HTTPS lets an unauthenticated client read memory belonging to other connections, including TLS private keys and other users' requests. TLSWrap::DoWrite() calls ClearOut() directly when asked to write zero bytes; if that write is issued from JavaScript running inside the HTTP parser's on_body callback, ClearOut() decrypts the next TLS record while the parser is still mid-body, re-entering llhttp_execute() and causing a use-after-free and an out-of-bounds heap read. The server then copies that freed or unrelated heap memory into the response for the request body. Triggering it requires a handler that calls res.flushHeaders() before the request body ends and later calls res.end() with a non-empty chunk, and reading the leaked memory requires any ordinary route that echoes or stores a request body. Cleartext node:http is not affected. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "osvalpine - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Alpine%2FALPINE-CVE-2026-123864.json?alt=media" }, { "category": "other", "text": "0.00333", "title": "EPSS" }, { "category": "other", "text": "4.1", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent EPSS score, There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to a product by vendor Open Source, Is related to an uncommon product vendor, There is product data available from source Debian", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-10084446", "CSAFPID-10084447", "CSAFPID-10084445", "CSAFPID-6014972", "CSAFPID-6239276", "CSAFPID-8476917", "CSAFPID-8476920", "CSAFPID-8505503", "CSAFPID-8505504", "CSAFPID-1408881", "CSAFPID-10088840", "CSAFPID-10088841", "CSAFPID-10088842", "CSAFPID-10088332", "CSAFPID-10088333", "CSAFPID-10088334", "CSAFPID-10088335", "CSAFPID-10092239", "CSAFPID-10092238" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-123864" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123864" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://vulnerabilities.ncsc.nl/manual/CVE-2026-123864" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-123864" }, { "category": "external", "summary": "Source - hkcert", "url": "https://www.hkcert.org/security-bulletin/node-js-multiple-vulnerabilities_20261112" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-123864" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-4525.json" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0492" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Alpine%2FALPINE-CVE-2026-123864.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-4525.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-4525" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd; redhat", "url": "https://nodejs.org/en/blog/vulnerability/november-2026-security-releases" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://cna.openjsf.org/security-advisories.html" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-123864" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123864" }, { "category": "external", "summary": "Reference - osv", "url": "https://security.alpinelinux.org/vuln/CVE-2026-123864" } ], "remediations": [ { "category": "mitigation", "details": "Offload TLS termination to a trusted reverse proxy or load balancer, and configure the Node.js application to serve traffic over cleartext HTTP bound only to localhost (127.0.0.1), as cleartext HTTP is not affected by this flaw.\nIf TLS must remain terminated by the Node.js process, restrict network access to trusted hosts using firewall rules to limit exposure:\n# firewall-cmd --permanent --zone=internal --add-port=/tcp\n# firewall-cmd --permanent --zone=public --remove-port=/tcp\n# firewall-cmd --reload\nCaveats:\nRestricting access to trusted networks or localhost prevents untrusted remote clients from reaching the service. Offloading TLS requires reconfiguring traffic routing and reverse proxy endpoints.\nWarning: Modifying firewall configurations and running `firewall-cmd --reload` will reload firewall rule sets and may cause momentary disruptions to active connections.", "product_ids": [ "CSAFPID-6014972", "CSAFPID-6239276", "CSAFPID-8476917", "CSAFPID-8476920", "CSAFPID-8505503", "CSAFPID-8505504" ] } ], "scores": [ { "cvss_v3": { "version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-10084445", "CSAFPID-10084446", "CSAFPID-10084447", "CSAFPID-10088332", "CSAFPID-10088333", "CSAFPID-10088334", "CSAFPID-10088335", "CSAFPID-10088840", "CSAFPID-10088841", "CSAFPID-10088842", "CSAFPID-10092238", "CSAFPID-10092239", "CSAFPID-1408881", "CSAFPID-6014972", "CSAFPID-6239276", "CSAFPID-8476917", "CSAFPID-8476920", "CSAFPID-8505503", "CSAFPID-8505504" ] } ], "title": "CVE-2026-123864" } ] }