| Name | CVE-2026-66374 |
| Description | Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path. |
| 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 |
|---|
| knot-resolver (PTS) | bullseye | 5.3.1-1+deb11u1 | vulnerable |
| bookworm, bookworm (security) | 5.6.0-1+deb12u1 | vulnerable |
| trixie | 5.7.5-1 | vulnerable |
| forky | 6.4.0-1 | vulnerable |
| sid | 6.4.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| knot-resolver | source | (unstable) | 6.4.1-1 | | | |
Notes
https://openwall.com/lists/oss-security/2026/07/23/6
https://github.com/venglin/knot-doq