| Name | CVE-2026-21712 |
| Description | A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process. |
| 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 | fixed |
| bullseye (security) | 12.22.12~dfsg-1~deb11u7 | fixed |
| bookworm, bookworm (security) | 18.20.4+dfsg-1~deb12u1 | fixed |
| trixie | 20.19.2+dfsg-1 | fixed |
| trixie (security) | 20.19.2+dfsg-1+deb13u2 | fixed |
| forky | 22.22.2+dfsg+~cs22.19.15-1 | fixed |
| sid | 22.22.2+dfsg+~cs22.19.15-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nodejs | source | (unstable) | (not affected) | | | |
Notes
- nodejs <not-affected> (Vulnerable code not present)
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#assertion-error-in-node_urlcc-via-malformed-url-format-leads-to-nodejs-crash-cve-2026-21712---medium