| 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 | fixed |
| bookworm, bookworm (security) | 5.6.0-1+deb12u1 | fixed |
| trixie | 5.7.5-1 | fixed |
| forky, sid | 6.4.2-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[trixie] - knot-resolver <not-affected> (Vulnerable code not present, quic support added in 6.2)
[bookworm] - knot-resolver <not-affected> (Vulnerable code not present, quic support added in 6.2)
[bullseye] - knot-resolver <not-affected> (Vulnerable code not present, quic support added in 6.2)
https://openwall.com/lists/oss-security/2026/07/23/6
https://github.com/venglin/knot-doq
https://lists.nic.cz/hyperkitty/list/knot-resolver-announce@lists.nic.cz/thread/ESUJGSCVLNPPWB2F3DUPKCVY5KBVPYF2/