CVE-2026-5172 The advisory has been revoked - it doesn't affect any version of package dnsmasq (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN11-DNSMASQ-16718723
- published17 May 2026
- disclosed11 May 2026
Introduced: 11 May 2026
CVE-2026-5172 (opens in a new tab)Amendment
The Debian security team deemed this advisory irrelevant for Debian:11.
NVD Description
Note: Versions mentioned in the description apply only to the upstream dnsmasq package and not the dnsmasq package as distributed by Debian.
A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.
References
- https://security-tracker.debian.org/tracker/CVE-2026-5172
- https://thekelleys.org.uk/dnsmasq/
- https://www.kb.cert.org/vuls/id/471747
- https://github.com/NixOS/nixpkgs/pull/519082
- https://github.com/NixOS/nixpkgs/pull/519093
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
- https://thekelleys.org.uk/dnsmasq/CVE/
- https://github.com/pi-hole/FTL/releases/tag/v6.6.2
- https://access.redhat.com/errata/RHSA-2026:19158
- https://access.redhat.com/security/cve/CVE-2026-5172
- https://bugzilla.redhat.com/show_bug.cgi?id=2458521
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json