RLSA-2026:20589

Synopsis

Important: dnsmasq security update

Description

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

* dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)

* dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)

* dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)

* dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)

* dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected products

Rocky Linux 8 aarch64 Rocky Linux 8 x86_64

Fixes

2439088 2458516 2458517 2458518 2458519

CVEs

CVE-2026-2291 CVE-2026-4890 CVE-2026-4891 CVE-2026-4892 CVE-2026-4893

Affected packages

Rocky Linux 8 aarch64 - AppStream

dnsmasq-0:2.79-36.el8_10.aarch64.rpm dnsmasq-0:2.79-36.el8_10.src.rpm dnsmasq-debuginfo-0:2.79-36.el8_10.aarch64.rpm dnsmasq-debugsource-0:2.79-36.el8_10.aarch64.rpm dnsmasq-utils-0:2.79-36.el8_10.aarch64.rpm dnsmasq-utils-debuginfo-0:2.79-36.el8_10.aarch64.rpm

Rocky Linux 8 x86_64 - AppStream

dnsmasq-0:2.79-36.el8_10.src.rpm dnsmasq-0:2.79-36.el8_10.x86_64.rpm dnsmasq-debuginfo-0:2.79-36.el8_10.x86_64.rpm dnsmasq-debugsource-0:2.79-36.el8_10.x86_64.rpm dnsmasq-utils-0:2.79-36.el8_10.x86_64.rpm dnsmasq-utils-debuginfo-0:2.79-36.el8_10.x86_64.rpm