CVE-2026-5172
CVE-2026-5172
CVE-2026-5172 is fixed in 7 products on 1 platform, first by dnsmasq 2.92-1ubuntu0.2, released May 11, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
8.8
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0268
85th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dnsmasq · Debian 12.15 (bookworm) | 2.90-4~deb12u2 | DEBIAN-CVE-2026-5172 | May 15, 2026 |
| dnsmasq · Debian 13.5 (trixie) | 2.91-1+deb13u1 | DEBIAN-CVE-2026-5172 | May 15, 2026 |
| dnsmasq · Debian 14 | 2.92-5 | DEBIAN-CVE-2026-5172 | May 15, 2026 |
| dnsmasq · RHEL 10 | 2.90-4.el10_0.1 | RHSA-2026:92677 | May 27, 2026 |
| dnsmasq · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm3 | dnsmasq 2.90-0ubuntu0.18.04.1+esm3 | May 27, 2026 |
| dnsmasq · Ubuntu 20.04 LTS (focal) | 2.90-0ubuntu0.20.04.1+esm2 | dnsmasq 2.90-0ubuntu0.20.04.1+esm2 | May 27, 2026 |
| dnsmasq · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.3 | dnsmasq 2.90-0ubuntu0.22.04.3 | May 27, 2026 |
| dnsmasq · Ubuntu 24.04.5 LTS (noble) | 2.90-2ubuntu0.3 | dnsmasq 2.90-2ubuntu0.3 | May 27, 2026 |
| dnsmasq · Ubuntu 25.10 (questing) | 2.91-1ubuntu0.2 | dnsmasq 2.91-1ubuntu0.2 | May 27, 2026 |
| dnsmasq · Ubuntu 26.04.1 LTS (resolute) | 2.92-1ubuntu0.2 | dnsmasq 2.92-1ubuntu0.2 | May 11, 2026 |
| dnsmasq · almalinux 10 | 2.90-7.el10_2 | ALSA-2026:19158 | May 19, 2026 |
| dnsmasq · amzn 2023 | 2.90-1.amzn2023.0.3 | ALAS2023-2026-1729 | May 25, 2026 |
| dnsmasq · ol 10 | 0:2.90-7.el10_2 | ELSA-2026-19158 | Jul 16, 2026 |
| dnsmasq · rocky 10 | 0:2.90-7.el10_2 | RLSA-2026:19158 | May 29, 2026 |
| dnsmasq-base · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm3 | dnsmasq-base 2.90-0ubuntu0.18.04.1+esm3 | May 27, 2026 |
| dnsmasq-base · Ubuntu 20.04 LTS (focal) | 2.90-0ubuntu0.20.04.1+esm2 | dnsmasq-base 2.90-0ubuntu0.20.04.1+esm2 | May 27, 2026 |
| dnsmasq-base · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.3 | dnsmasq-base 2.90-0ubuntu0.22.04.3 | May 27, 2026 |
| dnsmasq-base · Ubuntu 24.04.5 LTS (noble) | 2.90-2ubuntu0.3 | dnsmasq-base 2.90-2ubuntu0.3 | May 27, 2026 |
| dnsmasq-base · Ubuntu 25.10 (questing) | 2.91-1ubuntu0.2 | dnsmasq-base 2.91-1ubuntu0.2 | May 27, 2026 |
| dnsmasq-base · Ubuntu 26.04.1 LTS (resolute) | 2.92-1ubuntu0.2 | dnsmasq-base 2.92-1ubuntu0.2 | May 11, 2026 |
| dnsmasq-base-lua · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm3 | dnsmasq-base-lua 2.90-0ubuntu0.18.04.1+esm3 | May 27, 2026 |
| dnsmasq-base-lua · Ubuntu 20.04 LTS (focal) | 2.90-0ubuntu0.20.04.1+esm2 | dnsmasq-base-lua 2.90-0ubuntu0.20.04.1+esm2 | May 27, 2026 |
| dnsmasq-base-lua · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.3 | dnsmasq-base-lua 2.90-0ubuntu0.22.04.3 | May 27, 2026 |
| dnsmasq-base-lua · Ubuntu 24.04.5 LTS (noble) | 2.90-2ubuntu0.3 | dnsmasq-base-lua 2.90-2ubuntu0.3 | May 27, 2026 |
| dnsmasq-base-lua · Ubuntu 25.10 (questing) | 2.91-1ubuntu0.2 | dnsmasq-base-lua 2.91-1ubuntu0.2 | May 27, 2026 |
| dnsmasq-base-lua · Ubuntu 26.04.1 LTS (resolute) | 2.92-1ubuntu0.2 | dnsmasq-base-lua 2.92-1ubuntu0.2 | May 11, 2026 |
| dnsmasq-debuginfo · amzn 2023 | 2.90-1.amzn2023.0.3 | ALAS2023-2026-1729 | May 25, 2026 |
| dnsmasq-debugsource · amzn 2023 | 2.90-1.amzn2023.0.3 | ALAS2023-2026-1729 | May 25, 2026 |
| dnsmasq-utils · Ubuntu 18.04.6 LTS (bionic) | 2.90-0ubuntu0.18.04.1+esm3 | dnsmasq-utils 2.90-0ubuntu0.18.04.1+esm3 | May 27, 2026 |
| dnsmasq-utils · Ubuntu 20.04 LTS (focal) | 2.90-0ubuntu0.20.04.1+esm2 | dnsmasq-utils 2.90-0ubuntu0.20.04.1+esm2 | May 27, 2026 |
| dnsmasq-utils · Ubuntu 22.04.1 LTS (jammy) | 2.90-0ubuntu0.22.04.3 | dnsmasq-utils 2.90-0ubuntu0.22.04.3 | May 27, 2026 |
| dnsmasq-utils · Ubuntu 24.04.5 LTS (noble) | 2.90-2ubuntu0.3 | dnsmasq-utils 2.90-2ubuntu0.3 | May 27, 2026 |
| dnsmasq-utils · Ubuntu 25.10 (questing) | 2.91-1ubuntu0.2 | dnsmasq-utils 2.91-1ubuntu0.2 | May 27, 2026 |
| dnsmasq-utils · Ubuntu 26.04.1 LTS (resolute) | 2.92-1ubuntu0.2 | dnsmasq-utils 2.92-1ubuntu0.2 | May 11, 2026 |
| dnsmasq-utils · almalinux 10 | 2.90-7.el10_2 | ALSA-2026:19158 | May 19, 2026 |
| dnsmasq-utils · amzn 2023 | 2.90-1.amzn2023.0.3 | ALAS2023-2026-1729 | May 25, 2026 |
| dnsmasq-utils · ol 10 | 0:2.90-7.el10_2 | ELSA-2026-19158 | Jul 16, 2026 |
| dnsmasq-utils-debuginfo · amzn 2023 | 2.90-1.amzn2023.0.3 | ALAS2023-2026-1729 | May 25, 2026 |
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