Bug 2567091

Summary:	CVE-2026-121520 singularity-ce: BuildKit: Privilege escalation via unauthorized extended file attribute modification [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Joel Chamberlain <jochambe>
Component:	singularity-ce	Assignee:	Orphan Owner <extras-orphan>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	epel10	CC:	dave, go-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["b3d404c6-8951-447d-bae4-6225d6e3afa8"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2566567

Description Joel Chamberlain 2026-11-04 16:34:15 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

In BuildKit versions prior to v0.34.1, a malicious client with access to the BuildKit control APIs can submit a build request that sets an extended attribute on a file outside the BuildKit state directory. Extended attributes in the trusted. or security. namespaces may also be set, potentially giving a program on the host elevated privileges. This issue affects build services that accept build requests from untrusted users. The issue is fixed in v0.34.1.

Comment 1 Fedora Admin user for bugzilla script actions 2026-11-06 00:35:20 UTC

This package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.