CVE-2026-5172

Description

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.

PUBLISHED Reserved 2026-03-30 | Published 2026-05-11 | Updated 2026-05-11 | Assigner certcc

Problem types

CWE-787: Out-of-bounds Write

Product status

References

www.kb.cert.org/vuls/id/471747

lists.thekelleys.org.uk/...nsmasq-discuss/2026q2/018471.html

thekelleys.org.uk/dnsmasq/CVE/

github.com/NixOS/nixpkgs/pull/519082

github.com/NixOS/nixpkgs/pull/519093

github.com/pi-hole/FTL/releases/tag/v6.6.2

cve.org (CVE-2026-5172)

nvd.nist.gov (CVE-2026-5172)

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