| Name | CVE-2026-21637 |
| Description | TLS PSK/ALPN Callback Exceptions Bypass Error Handlers, Causing DoS and FD Leak |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| nodejs (PTS) | bullseye | 12.22.12~dfsg-1~deb11u4 | vulnerable |
| bullseye (security) | 12.22.12~dfsg-1~deb11u7 | vulnerable |
| bookworm, bookworm (security) | 18.20.4+dfsg-1~deb12u1 | vulnerable |
| trixie | 20.19.2+dfsg-1 | vulnerable |
| forky, sid | 22.21.1+dfsg+~cs22.19.0-6 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nodejs | source | (unstable) | 22.22.0+dfsg+~cs22.19.6-1 | | | |
Notes
https://nodejs.org/en/blog/vulnerability/december-2025-security-releases#tls-pskalpn-callback-exceptions-bypass-error-handlers-causing-dos-and-fd-leak-cve-2026-21637---medium