Bug 2566567 (CVE-2026-121520) - CVE-2026-121520 github.com/moby/buildkit: BuildKit: Privilege escalation via unauthorized extended file attribute modification
Summary: CVE-2026-121520 github.com/moby/buildkit: BuildKit: Privilege escalation via ...
Keywords:
Status: NEW
Alias: CVE-2026-121520
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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URL:
Whiteboard:
Depends On: 2567089 2567090 2567091 2567092 2567093 2567094 2567095 2567096 2567097 2567098 2567099
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-03 22:23 UTC by OSIDB Bzimport
Modified: 2026-11-04 17:04 UTC (History)
120 users (show)

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Description OSIDB Bzimport 2026-11-03 22:23:13 UTC 
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.
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