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CVE-2026-21713

Published: Mar 30, 2026Updated: May 10, 2026 Sources: CVE List NVD BDUCWE-208
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.4%
Top 69.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values. Node.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision. This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-208

Affected Products

Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
Node.jsNode.js FoundationOSS Libraries
nodenodejsOSS Libraries
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
node.js foundationoss-projectUSOSS Librariesaka nodejs foundation, node foundation
nodejsoss-projectUSOSS Librariesaka node.js, node

Exploitability

Official Patch Available

References

https://nodejs.org/en/blog/release/v25.8.2/
nodejs.org
https://nodejs.org/en/blog/release/v24.14.1/
nodejs.org
https://nodejs.org/en/blog/release/v22.22.2/
nodejs.org
and 4 more references View all →

Timeline

Published
Mar 30, 2026
Last Updated
May 10, 2026

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