dnsmasq: Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to ca...
CVE-2020-37127 is fixed in 4 products on 1 platform, first by dnsmasq 2.90-0ubuntu0.18.04.1+esm1, released January 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dnsmasq · Debian 12.15 (bookworm) | 2.80-1 | DEBIAN-CVE-2020-37127 | Feb 5, 2026 |
| dnsmasq · Debian 13.5 (trixie) | 2.80-1 | DEBIAN-CVE-2020-37127 | Feb 5, 2026 |
| dnsmasq · Debian 14 | 2.80-1 | DEBIAN-CVE-2020-37127 | Feb 5, 2026 |
| dnsmasq · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm1 | dnsmasq 2.90-0ubuntu0.18.04.1+esm1 | Jan 16, 2026 |
| dnsmasq · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.1 | dnsmasq 2.90-0ubuntu0.22.04.1 | Jan 16, 2026 |
| dnsmasq-base · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm1 | dnsmasq-base 2.90-0ubuntu0.18.04.1+esm1 | Jan 16, 2026 |
| dnsmasq-base · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.1 | dnsmasq-base 2.90-0ubuntu0.22.04.1 | Jan 16, 2026 |
| dnsmasq-base-lua · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm1 | dnsmasq-base-lua 2.90-0ubuntu0.18.04.1+esm1 | Jan 16, 2026 |
| dnsmasq-base-lua · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.1 | dnsmasq-base-lua 2.90-0ubuntu0.22.04.1 | Jan 16, 2026 |
| dnsmasq-utils · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm1 | dnsmasq-utils 2.90-0ubuntu0.18.04.1+esm1 | Jan 16, 2026 |
| dnsmasq-utils · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.1 | dnsmasq-utils 2.90-0ubuntu0.22.04.1 | Jan 16, 2026 |
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