RHSA-2026:3839 — Security Advisory
Red Hat Security Advisory: image-builder security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · March 5, 2026
Updated · November 4, 2026
Topic
An update for image-builder 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
A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood.
Security Fix(es):
-
crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729)
-
golang: net/url: Memory exhaustion in query parameter parsing in net/url (CVE-2025-61726)
-
crypto/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121)
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.