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Important: osbuild-composer security update
ALSA-2026:3753
Summary
An update is available to fix four security issues in osbuild-composer, a tool for creating customized operating system images. These issues could allow an attacker to cause the program to run slowly or crash, making it unusable. Update to the latest version to ensure your system remains secure.
What to do
- Update almalinux osbuild-composer to version 149-4.el9_7.alma.3.
- Update almalinux osbuild-composer-core to version 149-4.el9_7.alma.3.
- Update almalinux osbuild-composer-worker to version 149-4.el9_7.alma.3.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| almalinux | osbuild-composer | <= 149-4.el9_7.alma.3 | 149-4.el9_7.alma.3 |
| almalinux | osbuild-composer-core | <= 149-4.el9_7.alma.3 | 149-4.el9_7.alma.3 |
| almalinux | osbuild-composer-worker | <= 149-4.el9_7.alma.3 | 149-4.el9_7.alma.3 |
Original title
Important: osbuild-composer security update
Original 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):
* crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729)
* 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)
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.
Security Fix(es):
* crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729)
* 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)
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.
- https://access.redhat.com/errata/RHSA-2026:3753 Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2025-61726 Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2025-61728 Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2025-61729 Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2025-68121 Third Party Advisory
- https://bugzilla.redhat.com/2418462 Third Party Advisory
- https://bugzilla.redhat.com/2434431 Third Party Advisory
- https://bugzilla.redhat.com/2434432 Third Party Advisory
- https://bugzilla.redhat.com/2437111 Third Party Advisory
- https://errata.almalinux.org/9/ALSA-2026-3753.html Vendor Advisory
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 13 Mar 2026