Bug 2431026 (CVE-2026-23949)

Summary: CVE-2026-23949 jaraco.context: jaraco.context: Path traversal via malicious tar archives
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in jaraco.context. The `jaraco.context.tarball()` function is vulnerable to a Zip Slip path traversal when processing malicious tar archives. A remote attacker can exploit this by crafting a specially designed tar file, which, when extracted, allows files to be written outside the intended directory. This could lead to arbitrary file overwrites or information disclosure on the system.
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Bug Depends On: 2431058, 2431059, 2431060, 2431061    
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Description OSIDB Bzimport 2026-01-20 01:01:23 UTC 
jaraco.context, an open-source software package that provides some useful decorators and context managers, has a Zip Slip path traversal vulnerability in the `jaraco.context.tarball()` function starting in version 5.2.0 and prior to version 6.1.0. The vulnerability may allow attackers to extract files outside the intended extraction directory when malicious tar archives are processed. The strip_first_component filter splits the path on the first `/` and extracts the second component, while allowing `../` sequences. Paths like `dummy_dir/../../etc/passwd` become `../../etc/passwd`. Note that this suffers from a nested tarball attack as well with multi-level tar files such as `dummy_dir/inner.tar.gz`, where the inner.tar.gz includes a traversal `dummy_dir/../../config/.env` that also gets translated to `../../config/.env`. Version 6.1.0 contains a patch for the issue.