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TI-2026-17486 Aliases CVE-2026-21713GHSA-6r7g-3mm3-fhw7

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating…

Priority LOW 33CWE-208Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 3 fixed, 3 without a fix

Attack profile from CVSS 3.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-208.

Summary

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**.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00366 30th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 3 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NodeJSnode20.20.1 – 20.20.1; 22.22.1 – 22.22.1; 24.14.0 – 24.14.0; 25.8.1 – 25.8.1; 4.0 and later; 5.0 and later; 6.0 and later; 7.0 and later; 8.0 and later; 9.0 and later; 10.0 and later; 11.0 and later; 12.0 and later; 13.0 and later; 14.0 and later; 15.0 and later; 16.0 and later; 17.0 and later; 18.0 and later; 19.0 and later—No fix listedCNA
  • node VendorNodeJS Affected 20.20.1 – 20.20.1; 22.22.1 – 22.22.1; 24.14.0 – 24.14.0; 25.8.1 – 25.8.1; 4.0 and later; 5.0 and later; 6.0 and later; 7.0 and later; 8.0 and later; 9.0 and later; 10.0 and later; 11.0 and later; 12.0 and later; 13.0 and later; 14.0 and later; 15.0 and later; 16.0 and later; 17.0 and later; 18.0 and later; 19.0 and later Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*up to 20.20.1; 22.0.0 – 22.22.1; 24.0.0 – 24.14.0; 25.0.0 – 25.8.1VulnerableNodeJS
  • cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:* Versions up to 20.20.1; 22.0.0 – 22.22.1; 24.0.0 – 24.14.0; 25.0.0 – 25.8.1 Vulnerable ·NodeJS

Remediation

Red Hat 3 advisories

  • RHSA-2026:7670 Released 2026-04-13 · Red Hat rating Important
    nodejs:24 security update
    • Red Hat Enterprise Linux AppStream (v. 8) nodejs-1:24.14.1-2.module+el8.10.0+24190+49a46c75.aarch64::nodejs:24, nodejs-1:24.14.1-2.module+el8.10.0+24190+49a46c75.ppc64le::nodejs:24, nodejs-1:24.14.1-2.module+el8.10.0+24190+49a46c75.s390x::nodejs:24 +25
  • RHSA-2026:7675 Released 2026-04-13 · Red Hat rating Important
    nodejs24 security update
    • Red Hat Enterprise Linux AppStream (v. 10) nodejs24-1:24.14.1-2.el10_1, nodejs24-devel-1:24.14.1-2.el10_1, nodejs24-docs-1:24.14.1-2.el10_1 +3
  • RHSA-2026:7350 Released 2026-04-09 · Red Hat rating Important
    nodejs:24 security update
    • Red Hat Enterprise Linux AppStream (v. 9) nodejs-1:24.14.1-2.module+el9.7.0+24166+51c9666b.aarch64::nodejs:24, nodejs-1:24.14.1-2.module+el9.7.0+24166+51c9666b.ppc64le::nodejs:24, nodejs-1:24.14.1-2.module+el9.7.0+24166+51c9666b.s390x::nodejs:24 +25

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    nodejs node 10.*, 11.* and 14 more versions

    5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-17483 Resource allocation without limits in NodeJS nodePriority MEDIUM 60
    • TI-2026-17490 A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their…Priority LOW 26
    • TI-2026-17484 Improper access control in NodeJS nodePriority LOW 23
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:7675
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:7670
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:7350

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21713
  2. 2026-10-03 Alias added: GHSA-6r7g-3mm3-fhw7

References

Advisory 1

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2016-01993 The DES and Triple DES ciphers, as used in the TLS, SSH, and IPSec protocols and other… CVSS 3.1HIGH 7.5
  • TI-2024-03325 Command injection vulnerability in programing languages on Microsoft Windows operating system. CVSS 3.1CRITICAL 9.8
  • TI-2022-03472 X.509 Email Address Variable Length Buffer Overflow CVSS 3.1HIGH 7.5
  • TI-2022-03315 X.509 Email Address 4-byte Buffer Overflow CVSS 3.1HIGH 7.5
See all 186 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences