CVE-2026-5172

CVSS 7.3 HIGHEPSS 0.9%CWE-125

Vexday Risk Score

41Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 7.3EPSS 0.9%KEV nãoPoC públicaNuclei —Metasploit —Patch referenciado

Lifecycle

11 May 2026Published on NVD

27 May 2026Public PoC

Recommendation: Plan a near-term fix — a public PoC already exists.

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 · dnsmasq

public 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.

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References

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://github.com/NixOS/nixpkgs/pull/519082 https://github.com/NixOS/nixpkgs/pull/519093 https://github.com/pi-hole/FTL/releases/tag/v6.6.2 https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json https://thekelleys.org.uk/dnsmasq/CVE/https://www.kb.cert.org/vuls/id/471747