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Node.js CVE-2026-21713

| EUVDEUVD-2026-17174 MEDIUM
Observable Timing Discrepancy (CWE-208)
2026-03-30 hackerone
Node.js Information Disclosure Oracle
5.9
CVSS 3.0 · NVD
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Severity by source

NVD PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Ubuntu
MEDIUM
qualitative
SUSE
5.6 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Red Hat
5.9 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 30, 2026 - 19:30 euvd
EUVD-2026-17174
Analysis Generated
Mar 30, 2026 - 19:30 vuln.today
CVE Published
Mar 30, 2026 - 19:07 nvd
MEDIUM 5.9

DescriptionCVE.org

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.

AnalysisAI

Node.js versions 20.x, 22.x, 24.x, and 25.x use non-constant-time comparison for HMAC signature verification, allowing remote attackers to infer valid HMAC values through timing oracle attacks. The vulnerability leaks information proportional to matching bytes and requires high-resolution timing measurement capability, making exploitation feasible in controlled network conditions. CVSS 5.9 (confidentiality impact only); no public exploit identified at time of analysis.

Technical ContextAI

The vulnerability exists in Node.js HMAC verification logic where signature validation uses a vulnerable byte-by-byte comparison instead of the timing-safe comparison primitives available elsewhere in the codebase. HMAC (Hash-based Message Authentication Code) verification is cryptographic authentication mechanism where leaking timing information allows attackers to perform iterative byte-guessing attacks: by measuring response times, an attacker discovers which bytes of the HMAC match, progressively reconstructing the full HMAC value. The CWE categorizes this as information disclosure through timing channel leakage. Affected CPE: cpe:2.3:a:nodejs:node:*:*:*:*:*:*:*:* for versions 20.x through 25.x.

RemediationAI

Upgrade Node.js to patched versions as specified in the official Node.js security advisory (https://nodejs.org/en/blog/vulnerability/march-2026-security-releases). Debian users should apply DSA-6183-1 advisory (https://security-tracker.debian.org/tracker/dsa-6183-1); Ubuntu users should check their distribution tracking status as 8 releases are affected. As an interim mitigation, audit applications using HMAC verification and consider implementing additional authentication or integrity checks that do not rely on timing-sensitive operations, or restrict network access to trusted internal networks where timing measurement is not practical. Replace any non-constant-time signature verification logic with Node.js built-in timing-safe comparison functions (e.g., crypto.timingSafeEqual) if custom HMAC verification is in use.

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Same weakness CWE-208 – Observable Timing Discrepancy

View all
CVE-2026-23519 CRITICAL POC
9.8
CVE-2024-47178 HIGH POC
8.7
CVE-2025-68621 HIGH POC
7.4
CVE-2024-7010 MEDIUM POC
5.9
CVE-2021-26314 MEDIUM POC
5.5
CVE-2026-23849 MEDIUM POC
5.3
CVE-2025-30344 MEDIUM POC
5.3
CVE-2024-45052 MEDIUM POC
5.3

Same technique Information Disclosure

View all
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

Ubuntu

Priority: Medium
nodejs
Release Status Version
trusty needs-triage -
xenial needs-triage -
bionic needs-triage -
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing needs-triage -
upstream released 22.22.2+dfsg+~cs22.19.15-1

Debian

nodejs
Release Status Fixed Version Urgency
bullseye vulnerable 12.22.12~dfsg-1~deb11u4 -
bullseye (security) vulnerable 12.22.12~dfsg-1~deb11u7 -
bookworm, bookworm (security) vulnerable 18.20.4+dfsg-1~deb12u1 -
trixie fixed 20.19.2+dfsg-1+deb13u2 -
trixie (security) fixed 20.19.2+dfsg-1+deb13u2 -
forky vulnerable 22.22.1+dfsg+~cs22.19.15-1 -
sid fixed 22.22.2+dfsg+~cs22.19.15-1 -
(unstable) fixed 22.22.2+dfsg+~cs22.19.15-1 -
DSA-6183-1

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 12 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed

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CVE-2026-21713 vulnerability details – vuln.today
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