RHSA-2026:34508 — Security Advisory

An update for dnsmasq is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.