Unrated severityOSV Advisory· Published Jan 20, 2026· Updated Jan 21, 2026
CVE-2026-21637
CVE-2026-21637
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
57- osv-coords55 versionspkg:apk/chainguard/nodejs-20pkg:apk/chainguard/nodejs-20-docpkg:apk/chainguard/nodejs-22pkg:apk/chainguard/nodejs-22-docpkg:apk/chainguard/nodejs-24pkg:apk/chainguard/nodejs-24-docpkg:apk/chainguard/nodejs-25pkg:apk/wolfi/nodejs-20pkg:apk/wolfi/nodejs-20-docpkg:apk/wolfi/nodejs-22pkg:apk/wolfi/nodejs-22-docpkg:apk/wolfi/nodejs-24pkg:apk/wolfi/nodejs-24-docpkg:apk/wolfi/nodejs-25pkg:bitnami/nodepkg:bitnami/node-minpkg:rpm/almalinux/nodejspkg:rpm/almalinux/nodejs24pkg:rpm/almalinux/nodejs24-develpkg:rpm/almalinux/nodejs24-docspkg:rpm/almalinux/nodejs24-full-i18npkg:rpm/almalinux/nodejs24-libspkg:rpm/almalinux/nodejs24-npmpkg:rpm/almalinux/nodejs-develpkg:rpm/almalinux/nodejs-docspkg:rpm/almalinux/nodejs-full-i18npkg:rpm/almalinux/nodejs-libspkg:rpm/almalinux/nodejs-nodemonpkg:rpm/almalinux/nodejs-npmpkg:rpm/almalinux/nodejs-packagingpkg:rpm/almalinux/nodejs-packaging-bundlerpkg:rpm/almalinux/npmpkg:rpm/almalinux/v8-12.4-develpkg:rpm/almalinux/v8-13.6-develpkg:rpm/opensuse/nodejs20&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/nodejs22&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/nodejs22&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/nodejs22&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/nodejs24&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/nodejs24&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/nodejs26&distro=openSUSE%20Tumbleweedpkg:rpm/suse/nodejs20&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/nodejs20&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/nodejs20&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/nodejs20&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/nodejs20&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/nodejs20&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/nodejs22&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP7pkg:rpm/suse/nodejs22&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/nodejs22&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/nodejs22&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/nodejs22&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/nodejs24&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP7pkg:rpm/suse/nodejs24&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/nodejs24&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 20.20.0-r0+ 54 more
- (no CPE)range: < 20.20.0-r0
- (no CPE)range: < 20.20.0-r0
- (no CPE)range: < 22.22.0-r0
- (no CPE)range: < 22.22.0-r0
- (no CPE)range: < 24.13.0-r0
- (no CPE)range: < 24.13.0-r0
- (no CPE)range: < 25.3.0-r0
- (no CPE)range: < 20.20.0-r0
- (no CPE)range: < 20.20.0-r0
- (no CPE)range: < 22.22.0-r0
- (no CPE)range: < 22.22.0-r0
- (no CPE)range: < 24.13.0-r0
- (no CPE)range: < 24.13.0-r0
- (no CPE)range: < 25.3.0-r0
- (no CPE)range: < 20.20.0
- (no CPE)range: < 20.20.0
- (no CPE)range: < 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- (no CPE)range: < 1:24.13.0-1.el10_1
- (no CPE)range: < 1:24.13.0-1.el10_1
- (no CPE)range: < 1:24.13.0-1.el10_1
- (no CPE)range: < 1:24.13.0-1.el10_1
- (no CPE)range: < 1:24.13.0-1.el10_1
- (no CPE)range: < 1:11.6.2-1.24.13.0.1.el10_1
- (no CPE)range: < 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- (no CPE)range: < 1:22.22.0-3.el10_1
- (no CPE)range: < 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- (no CPE)range: < 1:24.13.0-0.module_el8.10.0+4113+bc863bc2
- (no CPE)range: < 3.0.3-1.module_el8.10.0+4061+f8ceeab9
- (no CPE)range: < 1:10.9.4-1.22.22.0.3.el10_1
- (no CPE)range: < 2021.06-6.module_el8.10.0+4086+70facd4a
- (no CPE)range: < 2021.06-6.module_el8.10.0+4086+70facd4a
- (no CPE)range: < 1:11.6.2-1.24.13.0.0.module_el8.10.0+4113+bc863bc2
- (no CPE)range: < 3:12.4.254.21-1.22.22.0.1.module_el8.10.0+4112+db1af44b
- (no CPE)range: < 3:13.6.233.17-1.24.13.0.0.module_el8.10.0+4113+bc863bc2
- (no CPE)range: < 20.20.0-150600.3.15.1
- (no CPE)range: < 22.22.0-150600.13.12.1
- (no CPE)range: < 22.22.0-160000.1.1
- (no CPE)range: < 22.22.0-1.1
- (no CPE)range: < 24.14.1-160000.1.1
- (no CPE)range: < 24.13.0-1.1
- (no CPE)range: < 26.3.1-1.1
- (no CPE)range: < 20.20.0-150500.11.24.1
- (no CPE)range: < 20.20.0-150500.11.24.1
- (no CPE)range: < 20.20.0-150500.11.24.1
- (no CPE)range: < 20.20.0-150600.3.15.1
- (no CPE)range: < 20.20.0-150500.11.24.1
- (no CPE)range: < 20.20.0-150600.3.15.1
- (no CPE)range: < 22.22.0-150700.3.6.1
- (no CPE)range: < 22.22.0-150600.13.12.1
- (no CPE)range: < 22.22.0-160000.1.1
- (no CPE)range: < 22.22.0-150600.13.12.1
- (no CPE)range: < 22.22.0-160000.1.1
- (no CPE)range: < 24.14.1-150700.15.8.1
- (no CPE)range: < 24.14.1-160000.1.1
- (no CPE)range: < 24.14.1-160000.1.1
Patches
Vulnerability mechanics
References
1News mentions
1- Patch Tuesday - April 2026Rapid7 Blog · Apr 14, 2026