Node.js is vulnerable to a remote HTTP/2 denial of service via a reachable assertion in Http2Session teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123863
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-11 19:17:32 UTC
Updated2026-11-11 19:17:32 UTC
DescriptionA reachable assertion in Node.js HTTP/2 session teardown lets any unauthenticated client abort the server, over both TLS and cleartext. A client can arrange for an Http2Stream that still holds nghttp2-allocated header buffers to outlive its session: the stream is removed from the session's stream set but never detached, so when ~Http2Session() runs the memory accounting is nonzero and the CHECK_EQ(current_nghttp2_memory_, 0) assertion fails, terminating the process. The trigger needs only a default http2 server whose handler responds before the request body has ended, which is typical. It is a variant of CVE-2024-27983 that the earlier fix did not cover, because that fix only detached streams still tracked in the session. This vulnerability affects Node.js 26.x (since 26.9.0) and 24.x (since 24.22.0).

Risk And Classification

Primary CVSS: v3.0 8.2 HIGH from ce714d77-add3-4f53-aff5-83d477b104bb

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Problem Types: CWE-617 | CWE-617 Reachable Assertion

VersionSourceTypeScoreSeverityVector
3.0ce714d77-add3-4f53-aff5-83d477b104bbSecondary8.2HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
3.0CNACVSS8.2HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nodejs Node affected 24.0.0 24.22.3 semver Not specified
CNA Nodejs Node affected 25.0.0 26.13.1 semver Not specified

References

ReferenceSourceLinkTags
cna.openjsf.org/security-advisories.html ce714d77-add3-4f53-aff5-83d477b104bb cna.openjsf.org
nodejs.org/en/blog/vulnerability/november-2026-security-releases ce714d77-add3-4f53-aff5-83d477b104bb nodejs.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Chris Rohlf in collaboration with Claude and Anthropic Research (en)

CNA: mcollina (en)

CNA: UlisesGascon (en)

CNA: pimterry (en)

CNA: ronag (en)

CNA: aduh95 (en)

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