CVE-2026-5172
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.3epss 2.7%
from disclosure to weapon16 days
Published on NVDMay 11
1st PoC+16d
exploitation probability
2.7%top 15% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
dnsmasq · dnsmasqpublic PoCs found — 1
githubgithub.com/lottiedeyan/CVE20265172poc★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://access.redhat.com/errata/RHSA-2026:19158https://access.redhat.com/security/cve/CVE-2026-5172https://bugzilla.redhat.com/show_bug.cgi?id=2458521https://github.com/NixOS/nixpkgs/pull/519082https://github.com/NixOS/nixpkgs/pull/519093https://github.com/pi-hole/FTL/releases/tag/v6.6.2https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.htmlhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.jsonhttps://thekelleys.org.uk/dnsmasq/CVE/https://www.kb.cert.org/vuls/id/471747