Node.js is vulnerable to an HTTP/2 memory exhaustion denial of service via unaccounted inbound DATA on an undrained stream

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123868
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-11 19:17:33 UTC
Updated2026-11-12 19:02:35 UTC
DescriptionAn unauthenticated HTTP/2 client can exhaust Node.js server memory because inbound DATA queued on an undrained stream is charged to no session budget. Each inbound DATA frame creates one JavaScript Buffer view in the receiving stream's readable queue, but nothing charges that queue to current_session_memory_: the socket read buffer is accounted only during parsing and released immediately, so whatever stays queued is accounted to nothing. A peer that fills a stream's receive window with one-byte DATA frames pays about 10 wire bytes per frame while the server retains about 114 bytes per frame, so a single stream on one connection can retain hundreds of megabytes from tens of megabytes sent. maxSessionMemory neither bounds the growth nor refuses new streams, because Http2Session::CanAddStream gates admission on the same counter that never sees the queue. This vulnerability affects Node.js 26.x and 24.x.

Risk And Classification

Primary CVSS: v3.0 5.9 MEDIUM from ce714d77-add3-4f53-aff5-83d477b104bb

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

Problem Types: CWE-400 | CWE-400 Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.0ce714d77-add3-4f53-aff5-83d477b104bbSecondary5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.0CNACVSS5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.0 Breakdown

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

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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: jiri1234 (en)

CNA: mcollina (en)

CNA: aduh95 (en)

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