CVE-2026-2291

Description

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

References

https://kb.cert.org/vuls/id/471747

https://www.suse.com/security/cve/CVE-2026-2291.html

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

https://thekelleys.org.uk/dnsmasq/CVE/

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html

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

https://github.com/NixOS/nixpkgs/pull/519093

https://github.com/NixOS/nixpkgs/pull/519082

http://www.openwall.com/lists/oss-security/2026/07/20/14

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS