Issued:

2026-06-02

Updated:

2026-06-02

RHSA-2026:22450 - Important: osbuild-composer security update

Synopsis

Important: osbuild-composer security update

Type/Severity

Security Advisory Important

Topic

An update for osbuild-composer 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

A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients.

Security Fix(es):

• golang: archive/zip: Excessive CPU consumption when building archive index in archive/zip (CVE-2025-61728)

• 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)

• crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137)

• net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)

• github.com/jackc/pgproto3: pgproto3: Denial of Service via negative field length in DataRow message (CVE-2026-4427,GHSA-jqcq-xjh3-6g23)

• google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186)

• github.com/jackc/pgproto3/v2: github.com/jackc/pgproto3/v2: Denial of Service via malicious PostgreSQL server (CVE-2026-32286)

• github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object (CVE-2026-34986)

• golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)

• crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283)

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

Updated Packages

• osbuild-composer-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-165.1-2.el10_2.s390x.rpm
• osbuild-composer-165.1-2.el10_2.src.rpm
• osbuild-composer-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-core-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-core-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-core-165.1-2.el10_2.s390x.rpm
• osbuild-composer-core-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-core-debuginfo-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-core-debuginfo-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-core-debuginfo-165.1-2.el10_2.s390x.rpm
• osbuild-composer-core-debuginfo-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-debuginfo-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-debuginfo-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-debuginfo-165.1-2.el10_2.s390x.rpm
• osbuild-composer-debuginfo-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-debugsource-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-debugsource-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-debugsource-165.1-2.el10_2.s390x.rpm
• osbuild-composer-debugsource-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-tests-debuginfo-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-tests-debuginfo-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-tests-debuginfo-165.1-2.el10_2.s390x.rpm
• osbuild-composer-tests-debuginfo-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-worker-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-worker-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-worker-165.1-2.el10_2.s390x.rpm
• osbuild-composer-worker-165.1-2.el10_2.x86_64.rpm
• osbuild-composer-worker-debuginfo-165.1-2.el10_2.aarch64.rpm
• osbuild-composer-worker-debuginfo-165.1-2.el10_2.ppc64le.rpm
• osbuild-composer-worker-debuginfo-165.1-2.el10_2.s390x.rpm
• osbuild-composer-worker-debuginfo-165.1-2.el10_2.x86_64.rpm

Fixes

• This content is not included.BZ - 2434431
• This content is not included.BZ - 2434432
• This content is not included.BZ - 2437111
• This content is not included.BZ - 2445345
• This content is not included.BZ - 2445356
• This content is not included.BZ - 2448626
• This content is not included.BZ - 2449833
• This content is not included.BZ - 2451847
• This content is not included.BZ - 2455470
• This content is not included.BZ - 2456336
• This content is not included.BZ - 2456338
• This content is not included.RHEL-179244
• This content is not included.RHEL-180005

CVEs

• CVE-2025-61726
• CVE-2025-61728
• CVE-2025-68121
• This content is not included.CVE-2026-4427
• CVE-2026-25679
• CVE-2026-27137
• CVE-2026-32282
• CVE-2026-32283
• CVE-2026-32286
• CVE-2026-33186
• CVE-2026-34986

References

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

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at Security Contacts and Procedures.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.