| Name | CVE-2026-4891 |
| Description | A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet. |
| 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) |
| References | DSA-6264-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| dnsmasq (PTS) | bullseye | 2.85-1 | vulnerable |
| bullseye (security) | 2.85-1+deb11u1 | vulnerable |
| bookworm | 2.90-4~deb12u1 | vulnerable |
| bookworm (security) | 2.90-4~deb12u2 | fixed |
| trixie | 2.91-1 | vulnerable |
| trixie (security) | 2.91-1+deb13u1 | fixed |
| forky | 2.92-4 | vulnerable |
| sid | 2.92-5 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
https://xchglabs.com/blog/dnsmasq-five-cves.html
Fixed by: https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=788b4e0f6c05217981b512bed4e5fea6f8855d01 (v2.93rc1)