CVE-2026-21637
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these
02 Description
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these
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.
- EPSS probability
- 1.11% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 65.5% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-06-17.
- 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
- 2026-01-20 20:41Z9 MO AGO
- Last updated
- 2026-01-21 20:22Z9 MO AGO
- Reserved
- 2026-01-01
- 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:N/I:N/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 088b7ccdfc7628d345a370dcd82fa7557284fdd456e1dba4db7d35d164aa908e
05 Affected products
06 References
07 Fixed in
AlmaLinux 8
- nodejs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el8.10.0+3982+85c136aa
- Affected before 3.0.1-1.module_el8.10.0+4006+3c416519
- Affected before 3.0.3-1.module_el8.10.0+4061+f8ceeab9
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el8.10.0+4084+7c0af990
- Affected before 2021.06-5.module_el8.10.0+4085+6f807d30
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el8.10.0+4084+7c0af990
- Affected before 2021.06-5.module_el8.10.0+4085+6f807d30
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.9.4-1.22.22.0.1.module_el8.10.0+4112+db1af44b
- Affected before 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
- Affected before 1:11.6.2-1.24.13.0.0.module_el8.10.0+4113+bc863bc2
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.22.0.1.module_el8.10.0+4112+db1af44b
- v8-13.6-devel Fixed
A version is affected if any line below covers it.
- Affected before 3:13.6.233.17-1.24.13.0.0.module_el8.10.0+4113+bc863bc2
- Affected before 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
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el9.5.0+125+8dc38870
- Affected before 3.0.1-1.module_el9.6.0+172+f0ba00ec
- Affected before 3.0.3-3.module_el9.7.0+209+ecf6523e
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el9.7.0+207+84573810
- Affected before 2021.06-5.module_el9.7.0+208+fb06c0ab
- Affected before 2021.06-6.module_el9.7.0+209+ecf6523e
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el9.7.0+196+ac40ca3b
- Affected before 2021.06-5.module_el9.7.0+207+84573810
- Affected before 2021.06-6.module_el9.7.0+198+8bf605ba
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.8.2-1.20.20.0.1.module_el9.7.0+207+84573810
- Affected before 1:10.9.4-1.22.22.0.1.module_el9.7.0+208+fb06c0ab
- Affected before 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
- Affected before 1:11.6.2-1.24.13.0.1.module_el9.7.0+209+ecf6523e
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.22.0.1.module_el9.7.0+208+fb06c0ab
- v8-13.6-devel Fixed
A version is affected if any line below covers it.
- Affected before 3:13.6.233.17-1.24.13.0.1.module_el9.7.0+209+ecf6523e
- Affected before 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
- nodejs-docs Fixed in 1:22.22.0-3.el10_1
- nodejs24-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:24.13.0-1.el10_1
- Affected before 1:24.14.1-2.el10_1
- nodejs24-npm Fixed
A version is affected if any line below covers it.
- Affected before 1:11.11.0-1.24.14.1.2.el10_1
- Affected before 1:11.6.2-1.24.13.0.1.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
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el8.10.0+4112+db1af44b
- Affected before 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- Affected before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el8.10.0+3982+85c136aa
- Affected before 3.0.1-1.module_el8.10.0+4006+3c416519
- Affected before 3.0.3-1.module_el8.10.0+4061+f8ceeab9
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el8.10.0+4084+7c0af990
- Affected before 2021.06-5.module_el8.10.0+4085+6f807d30
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el8.10.0+4084+7c0af990
- Affected before 2021.06-5.module_el8.10.0+4085+6f807d30
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.9.4-1.22.22.0.1.module_el8.10.0+4112+db1af44b
- Affected before 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
- Affected before 1:11.6.2-1.24.13.0.0.module_el8.10.0+4113+bc863bc2
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.22.0.1.module_el8.10.0+4112+db1af44b
- v8-13.6-devel Fixed
A version is affected if any line below covers it.
- Affected before 3:13.6.233.17-1.24.13.0.0.module_el8.10.0+4113+bc863bc2
- Affected before 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
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:20.20.0-1.module_el9.7.0+207+84573810
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.22.0-1.module_el9.7.0+208+fb06c0ab
- Affected before 1:24.13.0-1.module_el9.7.0+209+ecf6523e
- Affected before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el9.5.0+125+8dc38870
- Affected before 3.0.1-1.module_el9.6.0+172+f0ba00ec
- Affected before 3.0.3-3.module_el9.7.0+209+ecf6523e
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el9.7.0+207+84573810
- Affected before 2021.06-5.module_el9.7.0+208+fb06c0ab
- Affected before 2021.06-6.module_el9.7.0+209+ecf6523e
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-5.module_el9.7.0+196+ac40ca3b
- Affected before 2021.06-5.module_el9.7.0+207+84573810
- Affected before 2021.06-6.module_el9.7.0+198+8bf605ba
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.8.2-1.20.20.0.1.module_el9.7.0+207+84573810
- Affected before 1:10.9.4-1.22.22.0.1.module_el9.7.0+208+fb06c0ab
- Affected before 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
- Affected before 1:11.6.2-1.24.13.0.1.module_el9.7.0+209+ecf6523e
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.22.0.1.module_el9.7.0+208+fb06c0ab
- v8-13.6-devel Fixed
A version is affected if any line below covers it.
- Affected before 3:13.6.233.17-1.24.13.0.1.module_el9.7.0+209+ecf6523e
- Affected before 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
- nodejs-docs Fixed in 1:22.22.0-3.el10_1
- nodejs24-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:24.13.0-1.el10_1
- Affected before 1:24.14.1-2.el10_1
- nodejs24-npm Fixed
A version is affected if any line below covers it.
- Affected before 1:11.11.0-1.24.14.1.2.el10_1
- Affected before 1:11.6.2-1.24.13.0.1.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 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.