CVE-2026-21637
CVE-2026-21637
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.
CVSS 5.9 · Medium · EPSS 1.1% · Fix available
- Published
- Updated
Affected products and versions
node.js
- Versions
- ≥ 20.19.6, ≤ 20.19.6: Affected (semver)
- ≥ 22.21.1, ≤ 22.21.1: Affected (semver)
- ≥ 24.12.0, ≤ 24.12.0: Affected (semver)
- ≥ 25.2.1, ≤ 25.2.1: Affected (semver)
- ≥ 4.0, < 4.*: Affected (semver)
- ≥ 5.0, < 5.*: Affected (semver)
- ≥ 6.0, < 6.*: Affected (semver)
- ≥ 7.0, < 7.*: Affected (semver)
- ≥ 8.0, < 8.*: Affected (semver)
- ≥ 9.0, < 9.*: Affected (semver)
- ≥ 10.0, < 10.*: Affected (semver)
- ≥ 11.0, < 11.*: Affected (semver)
- ≥ 12.0, < 12.*: Affected (semver)
- ≥ 13.0, < 13.*: Affected (semver)
- ≥ 14.0, < 14.*: Affected (semver)
- ≥ 15.0, < 15.*: Affected (semver)
- ≥ 16.0, < 16.*: Affected (semver)
- ≥ 17.0, < 17.*: Affected (semver)
- ≥ 18.0, < 18.*: Affected (semver)
No fix published
nodejs Debian:12
- Versions
- 18.13.0+dfsg1-1
- 18.13.0+dfsg1-1.1
- 18.19.0+dfsg-1
- 18.19.0+dfsg-2
- 18.19.0+dfsg-3
- 18.19.0+dfsg-4
- 18.19.0+dfsg-5
- 18.19.0+dfsg-6
- 18.19.0+dfsg-6~deb12u1
- 18.19.0+dfsg-6~deb12u2
- 18.19.1+dfsg-1
- 18.19.1+dfsg-2
- 18.19.1+dfsg-3
- 18.19.1+dfsg-3.1
- 18.19.1+dfsg-4
- 18.19.1+dfsg-6
- 18.20.1+dfsg-1
- 18.20.1+dfsg-2
- 18.20.1+dfsg-3
- 18.20.1+dfsg-4
- 18.20.4+dfsg-1~deb12u1
- Affected ranges
- ECOSYSTEM: < 18.20.4+dfsg-1~deb12u2
Update to 18.20.4+dfsg-1~deb12u2
nodejs Debian:13
- Versions
- 20.19.2+dfsg-1
- 20.19.2+dfsg-1+deb13u1
- Affected ranges
- ECOSYSTEM: < 20.19.2+dfsg-1+deb13u2
Update to 20.19.2+dfsg-1+deb13u2
nodejs Debian:14
- Versions
- 20.19.2+dfsg-1
- 20.19.4+dfsg-1
- 20.19.5+dfsg+~cs20.19.12-1
- 20.19.5+dfsg+~cs20.19.12-2
- 20.19.5+dfsg+~cs20.19.12-3
- 20.19.5+dfsg+~cs20.19.12-4
- 20.19.5+dfsg+~cs20.19.24-1
- 22.12.0+dfsg-1
- 22.12.0+dfsg-2
- 22.12.0+dfsg-3
- 22.14.0+dfsg-1
- 22.18.0+dfsg+~cs22.17.2-1
- 22.18.0+dfsg+~cs22.17.2-2
- 22.18.0+dfsg-1
- 22.19.0+dfsg+~cs22.18.0-1
- 22.21.1+dfsg+~cs22.19.0-1
- 22.21.1+dfsg+~cs22.19.0-2
- 22.21.1+dfsg+~cs22.19.0-3
- 22.21.1+dfsg+~cs22.19.0-4
- 22.21.1+dfsg+~cs22.19.0-5
- 22.21.1+dfsg+~cs22.19.0-6
- 22.22.0+dfsg+~cs22.19.13-1
- 22.22.0+dfsg+~cs22.19.13-2
- 22.22.0+dfsg+~cs22.19.6-1
- 22.22.1+dfsg+~cs22.19.15-1
- Affected ranges
- ECOSYSTEM: < 22.22.2+dfsg+~cs22.19.15-1
Update to 22.22.2+dfsg+~cs22.19.15-1
nodejs Ubuntu:Pro:14.04:LTS
- Versions
- 0.10.15~dfsg1-4
- 0.10.21~dfsg1-1
- 0.10.22~dfsg1-2
- 0.10.23~dfsg1-1
- 0.10.23~dfsg1-2
- 0.10.23~dfsg1-3
- 0.10.24~dfsg1-1
- 0.10.25~dfsg2-2
- 0.10.25~dfsg2-2ubuntu1
- 0.10.25~dfsg2-2ubuntu1.2
- 0.10.25~dfsg2-2ubuntu1.2+esm1
- 0.10.25~dfsg2-2ubuntu1.2+esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:16.04:LTS
- Versions
- 0.10.25~dfsg2-2ubuntu1
- 4.2.2~dfsg-1
- 4.2.3~dfsg-1
- 4.2.4~dfsg-1ubuntu1
- 4.2.4~dfsg-2
- 4.2.6~dfsg-1ubuntu1
- 4.2.6~dfsg-1ubuntu4
- 4.2.6~dfsg-1ubuntu4.1
- 4.2.6~dfsg-1ubuntu4.2
- 4.2.6~dfsg-1ubuntu4.2+esm1
- 4.2.6~dfsg-1ubuntu4.2+esm2
- 4.2.6~dfsg-1ubuntu4.2+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:18.04:LTS
- Versions
- 6.11.4~dfsg-1ubuntu1
- 6.11.4~dfsg-1ubuntu2
- 6.12.0~dfsg-1ubuntu1
- 6.12.0~dfsg-2ubuntu1
- 6.12.0~dfsg-2ubuntu2
- 8.10.0~dfsg-2
- 8.10.0~dfsg-2ubuntu0.2
- 8.10.0~dfsg-2ubuntu0.3
- 8.10.0~dfsg-2ubuntu0.4
- 8.10.0~dfsg-2ubuntu0.4+esm1
- 8.10.0~dfsg-2ubuntu0.4+esm2
- 8.10.0~dfsg-2ubuntu0.4+esm3
- 8.10.0~dfsg-2ubuntu0.4+esm4
- 8.10.0~dfsg-2ubuntu0.4+esm5
- 8.10.0~dfsg-2ubuntu0.4+esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:20.04:LTS
- Versions
- 10.15.2~dfsg-2ubuntu1
- 10.17.0~dfsg-2ubuntu4
- 10.17.0~dfsg-2ubuntu6
- 10.19.0~dfsg-3ubuntu1
- 10.19.0~dfsg-3ubuntu1.1
- 10.19.0~dfsg-3ubuntu1.2
- 10.19.0~dfsg-3ubuntu1.3
- 10.19.0~dfsg-3ubuntu1.5
- 10.19.0~dfsg-3ubuntu1.6
- 10.19.0~dfsg-3ubuntu1.6+esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:22.04:LTS
- Versions
- 12.22.5~dfsg-5ubuntu1
- 12.22.7~dfsg-2ubuntu1
- 12.22.7~dfsg-2ubuntu3
- 12.22.9~dfsg-1ubuntu2
- 12.22.9~dfsg-1ubuntu3
- 12.22.9~dfsg-1ubuntu3.1
- 12.22.9~dfsg-1ubuntu3.2
- 12.22.9~dfsg-1ubuntu3.3
- 12.22.9~dfsg-1ubuntu3.4
- 12.22.9~dfsg-1ubuntu3.5
- 12.22.9~dfsg-1ubuntu3.6
- 12.22.9~dfsg-1ubuntu3.6+esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:24.04:LTS
- Versions
- 18.13.0+dfsg1-1ubuntu2
- 18.19.1+dfsg-2ubuntu4
- 18.19.1+dfsg-6ubuntu1
- 18.19.1+dfsg-6ubuntu2
- 18.19.1+dfsg-6ubuntu5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:25.10
- Versions
- 20.18.1+dfsg-1ubuntu2
- 20.19.2+dfsg-1
- 20.19.4+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:26.04:LTS
- Versions
- 20.19.4+dfsg-1
- 20.19.5+dfsg+~cs20.19.12-4
- 22.21.1+dfsg+~cs22.19.0-6ubuntu4
- 22.22.0+dfsg+~cs22.19.6-1ubuntu2
- 22.22.0+dfsg+~cs22.19.13-2ubuntu1
- 22.22.1+dfsg+~cs22.19.15-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published