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Red Hat osbuild-composer may let attackers gain higher privileges

published 2 months ago

Summary

The osbuild-composer tool included with Red Hat Linux has a security weakness that could allow a malicious user to run code with more rights than intended. This could let an attacker take control of parts of the system or disrupt services. Apply the latest Red Hat security update as soon as possible to close the gap.

What to do

Update redhat osbuild-composer to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-core to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-core-debuginfo to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-debuginfo to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-debugsource to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-tests-debuginfo to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-worker to version 0:101.3-4.el9_4.4.
Update redhat osbuild-composer-worker-debuginfo to version 0:101.3-4.el9_4.4.

Affected software

Ecosystem	Vendor	Product	Affected versions
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-core	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-core-debuginfo	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-debuginfo	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-debugsource	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-tests-debuginfo	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-worker	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4
Red Hat:rhel_e4s:9.4::appstream	redhat	osbuild-composer-worker-debuginfo	< 0:101.3-4.el9_4.4 Fix: upgrade to 0:101.3-4.el9_4.4

Original advisory text

Red Hat Security Advisory: osbuild-composer security update

References

https://access.redhat.com/errata/RHSA-2026:56959 Vendor Advisory
https://access.redhat.com/security/updates/classification/#important Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2449833 Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_56959.... Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-33186 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-33186 Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-33186 Vendor Advisory
https://github.com/grpc/grpc-go/security/advisories/GHSA-p77j-4mvh-x3m3 Third Party Advisory

Fix within

Internet-facing 3 days

Internal 60 days

Not known to be exploited
Can be exploited automatically (estimated)
Gives an attacker full control (estimated)

Severity

9.1 Critical

Timeline

Published20 Aug 2026

Updated22 Aug 2026

First seen22 Aug 2026

Sources

RHSA-2026:56959 · OSV

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