What’s Vulnerable › Vulnerabilities

CVE-2026-5172: CVE-2026-5172

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-11 · updated 2026-08-24
• Weakness: CWE-125

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.

Affected products

• dnsmasq: before 2.92rel2 — fixed in 2.92rel2

How to fix

Upgrade to a fixed version: dnsmasq 2.92rel2. Check the vendor advisory for mitigations.

References

• 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://thekelleys.org.uk/dnsmasq/CVE/
• https://www.kb.cert.org/vuls/id/471747
• 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

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