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 Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | RedHat | dnsmasq-0:2.90-7.el10_2 | * |
| Red Hat Enterprise Linux 8 | RedHat | dnsmasq-0:2.79-36.el8_10 | * |
| Red Hat Enterprise Linux 9 | RedHat | dnsmasq-0:2.85-18.el9_8.1 | * |
| Red Hat Enterprise Linux 9.6 Extended Update Support | RedHat | dnsmasq-0:2.85-17.el9_6.1 | * |
| Dnsmasq | Ubuntu | devel | * |
| Dnsmasq | Ubuntu | esm-infra-legacy/trusty | * |
| Dnsmasq | Ubuntu | esm-infra-legacy/xenial | * |
| Dnsmasq | Ubuntu | esm-infra/bionic | * |
| Dnsmasq | Ubuntu | esm-infra/focal | * |
| Dnsmasq | Ubuntu | esm-infra/xenial | * |
| Dnsmasq | Ubuntu | jammy | * |
| Dnsmasq | Ubuntu | noble | * |
| Dnsmasq | Ubuntu | questing | * |
| Dnsmasq | Ubuntu | resolute | * |
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