Vulnerability · Published Jan 20, 2026 · Assigned by hackerone
CVE-2026-21637
Medium 5.9
In plain English
A medium-severity uncontrolled resource consumption in node from nodejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.0)5.9Medium
Exploit odds (30 days)1.1%top 33.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | nodejs | 1:22.22.0-1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:8 | nodejs | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs | 1:24.13.0-0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:9 | nodejs | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs | 1:20.20.0-1.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:9 | nodejs | 1:22.22.0-1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs | 1:24.13.0-1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:8 | nodejs-devel | 1:24.13.0-0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:8 | nodejs-devel | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs-devel | 1:22.22.0-1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:9 | nodejs-devel | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs-devel | 1:20.20.0-1.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:9 | nodejs-devel | 1:22.22.0-1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs-devel | 1:24.13.0-1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:10 | nodejs-docs | 1:22.22.0-3.el10_1 | ALSA-2026:1843 |
| AlmaLinux:8 | nodejs-docs | 1:22.22.0-1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:8 | nodejs-docs | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs-docs | 1:24.13.0-0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:9 | nodejs-docs | 1:22.22.0-1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs-docs | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs-docs | 1:20.20.0-1.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:9 | nodejs-docs | 1:24.13.0-1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:8 | nodejs-full-i18n | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs-full-i18n | 1:24.13.0-0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:8 | nodejs-full-i18n | 1:22.22.0-1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:9 | nodejs-full-i18n | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs-full-i18n | 1:20.20.0-1.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:9 | nodejs-full-i18n | 1:24.13.0-1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:9 | nodejs-full-i18n | 1:22.22.0-1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:8 | nodejs-libs | 1:24.13.0-0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:8 | nodejs-libs | 1:22.22.0-1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:8 | nodejs-libs | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:9 | nodejs-libs | 1:24.13.0-1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:9 | nodejs-libs | 1:22.22.0-1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs-libs | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux:8 | nodejs-nodemon | 3.0.3-1.module_el8.10.0+4061+f8ceeab9 | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs-nodemon | 3.0.3-1.module_el8.10.0+4061+f8ceeab9 | ALSA-2026:2420 |
| AlmaLinux:8 | nodejs-nodemon | 3.0.1-1.module_el8.10.0+4006+3c416519 | ALSA-2026:2421 |
| AlmaLinux:8 | nodejs-nodemon | 3.0.1-1.module_el8.10.0+3982+85c136aa | ALSA-2026:2422 |
| AlmaLinux:9 | nodejs-nodemon | 3.0.1-1.module_el9.5.0+125+8dc38870 | ALSA-2026:2783 |
| AlmaLinux:9 | nodejs-nodemon | 3.0.1-1.module_el9.6.0+172+f0ba00ec | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs-nodemon | 3.0.3-3.module_el9.7.0+209+ecf6523e | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs-nodemon | 3.0.3-3.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:2420 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-5.module_el8.10.0+4084+7c0af990 | ALSA-2026:2422 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-5.module_el8.10.0+4085+6f807d30 | ALSA-2026:2421 |
| AlmaLinux:9 | nodejs-packaging | 2021.06-5.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs-packaging | 2021.06-6.module_el9.7.0+209+ecf6523e | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs-packaging | 2021.06-6.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:9 | nodejs-packaging | 2021.06-5.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-5.module_el8.10.0+4085+6f807d30 | ALSA-2026:2421 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:7670 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-5.module_el8.10.0+4084+7c0af990 | ALSA-2026:2422 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:2420 |
| AlmaLinux:9 | nodejs-packaging-bundler | 2021.06-5.module_el9.7.0+196+ac40ca3b | ALSA-2026:2782 |
| AlmaLinux:9 | nodejs-packaging-bundler | 2021.06-5.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+198+8bf605ba | ALSA-2026:7350 |
| AlmaLinux:9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+198+8bf605ba | ALSA-2026:2781 |
| AlmaLinux:10 | nodejs24-docs | 1:24.13.0-1.el10_1 | ALSA-2026:1842 |
| AlmaLinux:10 | nodejs24-docs | 1:24.14.1-2.el10_1 | ALSA-2026:7675 |
| AlmaLinux:10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 | ALSA-2026:7675 |
| AlmaLinux:10 | nodejs24-npm | 1:11.6.2-1.24.13.0.1.el10_1 | ALSA-2026:1842 |
| AlmaLinux:8 | npm | 1:11.6.2-1.24.13.0.0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:8 | npm | 1:10.9.4-1.22.22.0.1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:8 | npm | 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:9 | npm | 1:10.9.4-1.22.22.0.1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:9 | npm | 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux:9 | npm | 1:10.8.2-1.20.20.0.1.module_el9.7.0+207+84573810 | ALSA-2026:2783 |
| AlmaLinux:9 | npm | 1:11.6.2-1.24.13.0.1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:8 | v8-12.4-devel | 3:12.4.254.21-1.22.22.0.1.module_el8.10.0+4112+db1af44b | ALSA-2026:2421 |
| AlmaLinux:9 | v8-12.4-devel | 3:12.4.254.21-1.22.22.0.1.module_el9.7.0+208+fb06c0ab | ALSA-2026:2782 |
| AlmaLinux:8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux:8 | v8-13.6-devel | 3:13.6.233.17-1.24.13.0.0.module_el8.10.0+4113+bc863bc2 | ALSA-2026:2420 |
| AlmaLinux:9 | v8-13.6-devel | 3:13.6.233.17-1.24.13.0.1.module_el9.7.0+209+ecf6523e | ALSA-2026:2781 |
| AlmaLinux:9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| Alpine:v3.21 | nodejs | 22.22.2-r0 | ALPINE-CVE-2026-21637 |
| Alpine:v3.22 | nodejs | 22.22.0-r0, 22.22.2-r0 | ALPINE-CVE-2026-21637 |
| Alpine:v3.23 | nodejs | 24.14.1-r0 | ALPINE-CVE-2026-21637 |
| Alpine:v3.24 | nodejs | 24.14.1-r0 | ALPINE-CVE-2026-21637 |
| Debian:12 | nodejs | 18.20.4+dfsg-1~deb12u2 | DEBIAN-CVE-2026-21637 |
| Debian:13 | nodejs | 20.19.2+dfsg-1+deb13u2 | DSA-6183-1 |
| Debian:13 | nodejs | 20.19.2+dfsg-1+deb13u1 | DSA-6166-1 |
| Debian:13 | nodejs | 20.19.2+dfsg-1+deb13u2 | DEBIAN-CVE-2026-21637 |
| Debian:14 | nodejs | 22.22.2+dfsg+~cs22.19.15-1 | DEBIAN-CVE-2026-21637 |
| Rocky Linux:8 | nodejs | 1:20.20.0-1.module+el8.10.0+40077+29236b21 | RLSA-2026:2422 |
| Rocky Linux:8 | nodejs | 1:22.22.0-1.module+el8.10.0+40078+280dc7ce | RLSA-2026:2421 |
| Rocky Linux:8 | nodejs | 1:24.13.0-0.module+el8.10.0+40079+1d83e08b | RLSA-2026:2420 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.3-1.module+el8.10.0+2084+ab509703 | RLSA-2026:7670 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.3-1.module+el8.10.0+2084+ab509703 | RLSA-2026:2420 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1824+532140ee | RLSA-2026:2421 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.9.0+1760+903d54b9 | RLSA-2026:2421 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1988+437f3d23 | RLSA-2026:2421 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1989+e60144d9 | RLSA-2026:2421 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1824+532140ee | RLSA-2026:2422 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.9.0+1760+903d54b9 | RLSA-2026:2422 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1988+437f3d23 | RLSA-2026:2422 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1989+e60144d9 | RLSA-2026:2422 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40017+f0db1785 | RLSA-2026:2783 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40022+9ecc286c | RLSA-2026:2783 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40018+a011993d | RLSA-2026:2783 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2 | RLSA-2026:7350 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40018+a011993d | RLSA-2026:2782 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40022+9ecc286c | RLSA-2026:2782 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40017+f0db1785 | RLSA-2026:2782 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2 | RLSA-2026:2781 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40048+6d99f608 | RLSA-2026:7670 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40048+6d99f608 | RLSA-2026:2420 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-5.module+el9.7.0+40051+f2ef3f49 | RLSA-2026:2782 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-5.module+el9.7.0+40050+22a42328 | RLSA-2026:2782 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40052+e32ea525 | RLSA-2026:2781 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-5.module+el9.7.0+40050+22a42328 | RLSA-2026:2783 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-5.module+el9.7.0+40051+f2ef3f49 | RLSA-2026:2783 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40052+e32ea525 | RLSA-2026:7350 |
| Rocky Linux:10 | nodejs22 | 1:22.22.0-3.el10_1 | RLSA-2026:1843 |
| Rocky Linux:10 | nodejs24 | 1:24.13.0-1.el10_1 | RLSA-2026:1842 |
| Rocky Linux:10 | nodejs24 | 1:24.14.1-2.el10_1 | RLSA-2026:7675 |
| Ubuntu:24.04:LTS | nodejs | no fix listed | UBUNTU-CVE-2026-21637 |
| Ubuntu:25.10 | nodejs | no fix listed | UBUNTU-CVE-2026-21637 |
| Ubuntu:26.04:LTS | nodejs | no fix listed | UBUNTU-CVE-2026-21637 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H