Bug 2484827 (CVE-2026-7774)

Summary: CVE-2026-7774 python: CPython: Python tarfile: Arbitrary file write via crafted link entries
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the `tarfile.data_filter` function within the Python `tarfile` module. A remote attacker could exploit this vulnerability by providing a specially crafted tar archive containing malicious link entries, such as symlinks with empty or directory-like names. This bypass allows the attacker to redirect subsequent archive members outside the intended extraction directory, leading to arbitrary file writes on the system where the archive is extracted. The impact of this flaw is limited by the permissions of the extracting process.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2489774, 2489775    
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Description OSIDB Bzimport 2026-06-04 16:01:19 UTC 
tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.