RHSA-2026:24369 — Security Advisory
Red Hat Security Advisory: unbound security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · June 8, 2026
Updated · October 30, 2026
Topic
An update for unbound is now available for Red Hat Enterprise Linux 9.
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.
Description
The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
-
unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options (CVE-2026-42944)
-
unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages (CVE-2026-42959)
-
unbound: Unbound DNSSEC Validator Use-After-Free via Deep Copy Pointer Overwrite Leading to DoS and Possible Remote Code Execution (CVE-2026-33278)
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.