Bug 2499695 (CVE-2026-50163)

Summary: CVE-2026-50163 oras-go: Oras-go: Information disclosure and arbitrary file access via crafted tarball hardlinks
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, eglynn, gparvin, jdelft, jjoyce, jpretori, jschluet, jupierce, lgarciaa, lhh, mbiarnes, mburns, mgarciac, ppalepu, ppostler, prdhamdh, rhaigner, sghai, sidsharm, suppawar, vlaad
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in oras-go, a Go library used for managing OCI (Open Container Initiative) artifacts. An attacker can exploit this vulnerability by providing a specially crafted tarball containing a malicious hardlink. When this tarball is extracted, the hardlink can be manipulated to point to files outside the intended extraction location, specifically within the victim's current working directory. This allows an attacker to read sensitive information from the system, and in some cases, could lead to unauthorized access to critical system files if the component is operating with elevated privileges.
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Description OSIDB Bzimport 2026-07-13 14:41:03 UTC 
The tar-extraction helper ensureLinkPath in oras-go validates that a hardlink's target resolves inside the extract base, but returns the original unresolved target string. For TypeLink hardlinks, os.Link() resolves relative paths against the process CWD, not the extract directory. An attacker controlling an OCI registry can craft a tarball with a hardlink entry whose relative Linkname points outside the extract directory, creating a hardlink to arbitrary files in the process CWD. Fixed in oras-go v2.6.1.