| Name | CVE-2026-16729 |
| Description | undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0. |
| 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) |
| Debian Bugs | 1143063 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| node-undici (PTS) | bookworm | 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 | vulnerable |
| bookworm (security) | 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 | vulnerable | |
| trixie | 7.3.0+dfsg1+~cs24.12.11-1 | vulnerable | |
| forky, sid | 8.10.2+dfsg+~cs3.2.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| node-undici | source | (unstable) | 8.9.0+dfsg+~cs3.2.0-1 | 1143063 |
[trixie] - node-undici <no-dsa> (Minor issue)
[bookworm] - node-undici <postponed> (Minor issue)
https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm