RHSA-2026:71543 - Security Advisory

Topic

An update for cockpit-image-builder is now available for Red Hat Enterprise Linux 10.

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 image-builder-frontend generates custom images suitable for deploying systems or uploading to the cloud. It integrates into Cockpit as a frontend for osbuild.

Security Fix(es):

• fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)
• fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)
• fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)
• fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 10 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 s390x

Fixes

• BZ - 2521778 - CVE-2026-75899 fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding
• BZ - 2521779 - CVE-2026-75975 fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization
• BZ - 2521798 - CVE-2026-76172 fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects
• BZ - 2527747 - CVE-2026-84292 fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization

CVEs

• CVE-2026-75899
• CVE-2026-75975
• CVE-2026-76172
• CVE-2026-84292

References

• https://access.redhat.com/security/updates/classification/#important