CVE-2026-21713

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Summary

CVECVE-2026-21713
StatePUBLISHED
Assignerhackerone
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-30 20:16:19 UTC
Updated2026-04-01 14:24:21 UTC
DescriptionA 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**.

Risk And Classification

Primary CVSS: v3.0 5.9 MEDIUM from [email protected]

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

EPSS: 0.000110000 probability, percentile 0.014280000 (date 2026-04-01)

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.0CNADECLARED5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.0 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nodejs Node affected 20.20.1 20.20.1 semver Not specified
CNA Nodejs Node affected 22.22.1 22.22.1 semver Not specified
CNA Nodejs Node affected 24.14.0 24.14.0 semver Not specified
CNA Nodejs Node affected 25.8.1 25.8.1 semver Not specified
CNA Nodejs Node affected 4.0 4.* semver Not specified
CNA Nodejs Node affected 5.0 5.* semver Not specified
CNA Nodejs Node affected 6.0 6.* semver Not specified
CNA Nodejs Node affected 7.0 7.* semver Not specified
CNA Nodejs Node affected 8.0 8.* semver Not specified
CNA Nodejs Node affected 9.0 9.* semver Not specified
CNA Nodejs Node affected 10.0 10.* semver Not specified
CNA Nodejs Node affected 11.0 11.* semver Not specified
CNA Nodejs Node affected 12.0 12.* semver Not specified
CNA Nodejs Node affected 13.0 13.* semver Not specified
CNA Nodejs Node affected 14.0 14.* semver Not specified
CNA Nodejs Node affected 15.0 15.* semver Not specified
CNA Nodejs Node affected 16.0 16.* semver Not specified
CNA Nodejs Node affected 17.0 17.* semver Not specified
CNA Nodejs Node affected 18.0 18.* semver Not specified
CNA Nodejs Node affected 19.0 19.* semver Not specified

References

ReferenceSourceLinkTags
nodejs.org/en/blog/vulnerability/march-2026-security-releases [email protected] nodejs.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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