CVE-2026-2291: CVE-2026-2291

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-11 · updated 2026-07-20

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.

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://www.suse.com/security/cve/CVE-2026-2291.html
http://www.openwall.com/lists/oss-security/2026/07/20/14

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