CVE-2026-4891
Fixed in a distro release EPSS 6%CVSS 5.3
A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
Products: dnsmasq, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat OpenShift Container Platform 4.19, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | dnsmasq | 2.90-7.el10_2 |
| AlmaLinux 10 | dnsmasq-utils | 2.90-7.el10_2 |
| AlmaLinux 8 | dnsmasq | 2.79-36.el8_10 |
| AlmaLinux 8 | dnsmasq-utils | 2.79-36.el8_10 |
| AlmaLinux 9 | dnsmasq | 2.85-18.el9_8.1 |
| AlmaLinux 9 | dnsmasq-utils | 2.85-18.el9_8.1 |
| Alpine 3.22 | dnsmasq | 2.91-r1 |
| Alpine 3.23 | dnsmasq | 2.91-r1 |
| Alpine 3.24 | dnsmasq | 2.92_p2-r0 |
| Chainguard | dnsmasq | 2.93-r0 |
| Chainguard | dnsmasq-doc | 2.93-r0 |
| Debian 12 | dnsmasq | 2.90-4~deb12u2 |
| Debian 13 | dnsmasq | 2.91-1+deb13u1 |
| Debian 14 | dnsmasq | 2.92-5 |
| Red Hat Enterprise Linux 10.2 | dnsmasq | 0:2.90-7.el10_2 |
| Red Hat Enterprise Linux 10.2 | dnsmasq-debuginfo | 0:2.90-7.el10_2 |
| Red Hat Enterprise Linux 10.2 | dnsmasq-debugsource | 0:2.90-7.el10_2 |
| Red Hat Enterprise Linux 10.2 | dnsmasq-utils | 0:2.90-7.el10_2 |
| Red Hat Enterprise Linux 10.2 | dnsmasq-utils-debuginfo | 0:2.90-7.el10_2 |
| Red Hat Enterprise Linux 8 | dnsmasq | 0:2.79-36.el8_10 |
| Red Hat Enterprise Linux 8 | dnsmasq-debuginfo | 0:2.79-36.el8_10 |
| Red Hat Enterprise Linux 8 | dnsmasq-debugsource | 0:2.79-36.el8_10 |
| Red Hat Enterprise Linux 8 | dnsmasq-utils | 0:2.79-36.el8_10 |
| Red Hat Enterprise Linux 8 | dnsmasq-utils-debuginfo | 0:2.79-36.el8_10 |
| Red Hat Enterprise Linux 9 | dnsmasq | 0:2.85-18.el9_8.1 |
| Red Hat Enterprise Linux 9 | dnsmasq-debuginfo | 0:2.85-18.el9_8.1 |
| Red Hat Enterprise Linux 9 | dnsmasq-debugsource | 0:2.85-18.el9_8.1 |
| Red Hat Enterprise Linux 9 | dnsmasq-utils | 0:2.85-18.el9_8.1 |
| Red Hat Enterprise Linux 9 | dnsmasq-utils-debuginfo | 0:2.85-18.el9_8.1 |
| Red Hat rhel eus 9.6 | dnsmasq | 0:2.85-17.el9_6.1 |
| Red Hat rhel eus 9.6 | dnsmasq-debuginfo | 0:2.85-17.el9_6.1 |
| Red Hat rhel eus 9.6 | dnsmasq-debugsource | 0:2.85-17.el9_6.1 |
| Red Hat rhel eus 9.6 | dnsmasq-utils | 0:2.85-17.el9_6.1 |
| Red Hat rhel eus 9.6 | dnsmasq-utils-debuginfo | 0:2.85-17.el9_6.1 |
| Rocky Linux 10 | dnsmasq | 0:2.90-7.el10_2 |
| Rocky Linux 8 | dnsmasq | 0:2.79-36.el8_10 |
| Rocky Linux 9 | dnsmasq | 0:2.85-18.el9_8.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | dnsmasq | 2.92rel2-18.27.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | dnsmasq | 2.92rel2-18.27.1 |
| Ubuntu 22.04 LTS | dnsmasq | 2.90-0ubuntu0.22.04.3 |
| Ubuntu 24.04 LTS | dnsmasq | 2.90-2ubuntu0.3 |
| Ubuntu 25.10 | dnsmasq | 2.91-1ubuntu0.2 |
| Ubuntu 26.04 LTS | dnsmasq | 2.92-1ubuntu0.2 |
| Ubuntu Pro 14.04 LTS | dnsmasq | 2.68-1ubuntu0.2+esm5 |
| Ubuntu Pro 16.04 LTS | dnsmasq | 2.90-0ubuntu0.16.04.1+esm3 |
| Ubuntu Pro 18.04 LTS | dnsmasq | 2.90-0ubuntu0.18.04.1+esm3 |
| Ubuntu Pro 20.04 LTS | dnsmasq | 2.90-0ubuntu0.20.04.1+esm2 |
| Wolfi | dnsmasq | 2.93-r0 |
| Wolfi | dnsmasq-doc | 2.93-r0 |
| openSUSE Tumbleweed | dnsmasq | 2.92rel2-1.1 |