{ "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-2026-123866", "tracking": { "current_release_date": "2026-11-13T19:27:59.643821Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-123866", "initial_release_date": "2026-11-11T18:38:59.405322Z", "revision_history": [ { "date": "2026-11-11T18:38:59.405322Z", "number": "1", "summary": "CWES created (1).| Products created (3).| References created (2).| Description created for source.| Unknown change." }, { "date": "2026-11-11T18:39:07.483541Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-11-11T19:32:18.576556Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-11-11T19:32:19.962244Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-11-12T00:34:29.746369Z", "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": "2026-11-12T00:34:31.415879Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-11-12T02:41:47.713632Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-11-12T06:44:35.596359Z", "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": "2026-11-12T12:19:48.405788Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| Products connected (3).| References created (3)." }, { "date": "2026-11-12T12:19:51.334152Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-11-12T14:20:19.025614Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-11-12T16:16:58.401699Z", "number": "13", "summary": "EPSS created.| Unknown change." }, { "date": "2026-11-12T16:19:42.004695Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-11-12T16:28:59.905094Z", "number": "15", "summary": "CVSS created.| Products created (4).| References created (1).| Description created for source.| Unknown change." }, { "date": "2026-11-12T16:29:07.122083Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-11-13T00:16:50.604394Z", "number": "17", "summary": "Products created (1)." }, { "date": "2026-11-13T19:27:28.947778Z", "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|<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" }, { "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-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" } ], "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-2026-123866", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "A use-after-free in Node.js HTTP/2 stream teardown can leak response memory, including the contents of other connections' response buffers, to a peer. When a stream is torn down while a write is still backpressured, for example by a peer RST_STREAM or by the server's own per-stream timeout destroying the stream, the stream's response buffer is freed but a reference to it is still used, so freed or unrelated heap memory is written to the socket instead of the intended response. On Node.js 26.x and 24.x the teardown can be driven purely by a remote peer once the window-size change from 26.9.0 and 24.22.0 is present, and on all supported lines the same defect is reachable through an application-initiated teardown such as a per-stream idle timeout. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-123866" }, { "category": "description", "text": "A use-after-free in Node.js HTTP/2 stream teardown can leak response memory, including the contents of other connections' response buffers, to a peer. When a stream is torn down while a write is still backpressured, for example by a peer RST_STREAM or by the server's own per-stream timeout destroying the stream, the stream's response buffer is freed but a reference to it is still used, so freed or unrelated heap memory is written to the socket instead of the intended response. On Node.js 26.x and 24.x the teardown can be driven purely by a remote peer once the window-size change from 26.9.0 and 24.22.0 is present, and on all supported lines the same defect is reachable through an application-initiated teardown such as a per-stream idle timeout. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-123866" }, { "category": "description", "text": "A flaw was found in Node.js. A use-after-free vulnerability in the HTTP/2 stream handling mechanism allows for information disclosure. When a stream is terminated while outgoing data is delayed, the server frees the response buffer prematurely while continuing to reference it. A remote attacker can exploit this condition to cause the server to transmit unrelated memory from the heap, potentially exposing sensitive data belonging to other user connections.\nThis vulnerability is classified as an Important severity flaw because an unauthenticated remote attacker can trigger memory disclosure across active connections, potentially exposing confidential data from other users' sessions. In Red Hat environments, impact is limited to applications that explicitly enable and expose HTTP/2 services, whereas deployments using standard HTTP/1.1 interfaces are unaffected. Under vulnerable configurations, abrupt stream terminations during pending writes allow freed memory segments to be returned over the network socket.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-123866" }, { "category": "description", "text": "A use-after-free in Node.js HTTP/2 stream teardown can leak response memory, including the contents of other connections' response buffers, to a peer. When a stream is torn down while a write is still backpressured, for example by a peer RST_STREAM or by the server's own per-stream timeout destroying the stream, the stream's response buffer is freed but a reference to it is still used, so freed or unrelated heap memory is written to the socket instead of the intended response. On Node.js 26.x and 24.x the teardown can be driven purely by a remote peer once the window-size change from 26.9.0 and 24.22.0 is present, and on all supported lines the same defect is reachable through an application-initiated teardown such as a per-stream idle timeout. This vulnerability affects Node.js 26.x, 24.x, and 22.x.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-123866" }, { "category": "description", "text": "A use-after-free in Node.js HTTP/2 stream teardown can leak response memory, including the contents of other connections' response buffers, to a peer. When a stream is torn down while a write is still backpressured, for example by a peer RST_STREAM or by the server's own per-stream timeout destroying the stream, the stream's response buffer is freed but a reference to it is still used, so freed or unrelated heap memory is written to the socket instead of the intended response. On Node.js 26.x and 24.x the teardown can be driven purely by a remote peer once the window-size change from 26.9.0 and 24.22.0 is present, and on all supported lines the same defect is reachable through an application-initiated teardown such as a per-stream idle timeout. 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-2026-123866.json?alt=media" }, { "category": "other", "text": "0.00481", "title": "EPSS" }, { "category": "other", "text": "3.9", "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-10092238" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-123866" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123866" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://vulnerabilities.ncsc.nl/manual/CVE-2026-123866" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-123866" }, { "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-2026-123866" }, { "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 - first", "url": "https://api.first.org/data/v1/epss" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Alpine%2FALPINE-CVE-2026-123866.json?alt=media" }, { "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-2026-123866" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123866" }, { "category": "external", "summary": "Reference - osv", "url": "https://security.alpinelinux.org/vuln/CVE-2026-123866" } ], "remediations": [ { "category": "mitigation", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.", "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:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "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-1408881", "CSAFPID-6014972", "CSAFPID-6239276", "CSAFPID-8476917", "CSAFPID-8476920", "CSAFPID-8505503", "CSAFPID-8505504" ] } ], "title": "CVE-2026-123866" } ] }