Bug 2571670

Summary: CVE-2026-124745 busybox: tar deferred hardlink target resolved through a deferred symlink escapes the extraction directory [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: busyboxAssignee: Tom "spot" Callaway <spotrh>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: admiller, davide, dvlasenk, epel-packagers-sig, spotrh, suraj.ghimire7
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["9fc92ab7-2de2-4912-a080-3ee7a191c4d2"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
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Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2571637    

Description Vladimir Vasilev 2026-11-11 12:24:00 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.

A flaw was found in BusyBox's tar. The target of a deferred hardlink is resolved through deferred symlinks in its directory components: a symlink entry pointing outside the extraction directory, followed by a hardlink entry whose target passes through that symlink, makes the created hardlink refer to a file outside the extraction directory. A crafted archive can exploit this to pull an arbitrary outside file into the extraction tree as a hardlink; a second archive extracted into the same directory with an overwriting extractor could then replace the outside file's content.