synced 10 MIN AGO
01 Record

CVE-2026-21713

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.

MediumPUBLISHEDCNA: hackerone
CNA base score5.9 CVSS v3.xCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
View raw JSON

02 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.

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.36% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 30.3% of scored records. A rank, not a probability.
NVD base score
5.9 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-08-19.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-03-30 19:07Z7 MO AGO
Last updated
2026-05-10 13:17Z5 MO AGO
Reserved
2026-01-04
Assigning CNA
hackerone
Record state
PUBLISHED
Severity
Medium (CVSS 5.9)
CNA CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
  • CWE-208Observable Timing DiscrepancyBase
Data version
5.2
Document digest
425df4b08c7d54c4a6b5f7ac7ca2d8a76312edaf2f66ccf2d89a10979f0b59ca

05 Affected products

VendorProductVersionsPlatforms
nodejsnode20.20.1 to 20.20.1, 22.22.1 to 22.22.1, 24.14.0 to 24.14.0, 25.8.1 to 25.8.1, 4.0 to < 4.*, 5.0 to < 5.*, 6.0 to < 6.*, 7.0 to < 7.*, 8.0 to < 8.*, 9.0 to < 9.*, 10.0 to < 10.*, 11.0 to < 11.*, 12.0 to < 12.*, 13.0 to < 13.*, 14.0 to < 14.*, 15.0 to < 15.*, 16.0 to < 16.*, 17.0 to < 17.*, 18.0 to < 18.*, 19.0 to < 19.*—

06 References

07 Fixed in

AlmaLinux 8

  • nodejs
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-devel
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-docs
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-full-i18n
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-libs
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-nodemon
    Fixed in 3.0.3-1.module_el8.10.0+4061+f8ceeab9
  • nodejs-packaging
    Fixed in 2021.06-6.module_el8.10.0+4086+70facd4a
  • nodejs-packaging-bundler
    Fixed in 2021.06-6.module_el8.10.0+4086+70facd4a
  • npm
    Fixed in 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
  • v8-13.6-devel
    Fixed in 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • nodejs
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-devel
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-docs
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-full-i18n
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-libs
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-nodemon
    Fixed in 3.0.3-3.module_el9.7.0+209+ecf6523e
  • nodejs-packaging
    Fixed in 2021.06-6.module_el9.7.0+209+ecf6523e
  • nodejs-packaging-bundler
    Fixed in 2021.06-6.module_el9.7.0+198+8bf605ba
  • npm
    Fixed in 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
  • v8-13.6-devel
    Fixed in 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • nodejs24-docs
    Fixed in 1:24.14.1-2.el10_1
  • nodejs24-npm
    Fixed in 1:11.11.0-1.24.14.1.2.el10_1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • nodejs
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-devel
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-docs
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-full-i18n
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-libs
    Fixed in 1:24.14.1-2.module_el8.10.0+4160+4819ac42
  • nodejs-nodemon
    Fixed in 3.0.3-1.module_el8.10.0+4061+f8ceeab9
  • nodejs-packaging
    Fixed in 2021.06-6.module_el8.10.0+4086+70facd4a
  • nodejs-packaging-bundler
    Fixed in 2021.06-6.module_el8.10.0+4086+70facd4a
  • npm
    Fixed in 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
  • v8-13.6-devel
    Fixed in 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • nodejs
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-devel
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-docs
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-full-i18n
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-libs
    Fixed in 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
  • nodejs-nodemon
    Fixed in 3.0.3-3.module_el9.7.0+209+ecf6523e
  • nodejs-packaging
    Fixed in 2021.06-6.module_el9.7.0+209+ecf6523e
  • nodejs-packaging-bundler
    Fixed in 2021.06-6.module_el9.7.0+198+8bf605ba
  • npm
    Fixed in 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
  • v8-13.6-devel
    Fixed in 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • nodejs24-docs
    Fixed in 1:24.14.1-2.el10_1
  • nodejs24-npm
    Fixed in 1:11.11.0-1.24.14.1.2.el10_1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • nodejs
    Fixed in 18.20.4+dfsg-1~deb12u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • nodejs
    Fixed in 20.19.2+dfsg-1+deb13u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • nodejs
    Fixed in 22.22.2+dfsg+~cs22.19.15-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.