Node.js is vulnerable to HTTP/2 response memory disclosure via a use-after-free during stream teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123866
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-11 19:17:33 UTC
Updated2026-11-11 19:17:33 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 7.5 HIGH from ce714d77-add3-4f53-aff5-83d477b104bb

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

Problem Types: CWE-416 | CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.0ce714d77-add3-4f53-aff5-83d477b104bbSecondary7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.0CNACVSS7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.0 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nodejs Node affected 0.0.0 22.23.5 semver Not specified
CNA Nodejs Node affected 23.0.0 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: aidan02 (en)

CNA: mcollina (en)

CNA: aduh95 (en)

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