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CVE-2026-11940 is a path traversal and destination-directory escape vulnerability in CPython's tarfile module. The flaw affects tarfile.extractall() when used with the 'data' or 'tar' extraction filter. A crafted tar archive can bypass the intended extraction confinement by using a hardlink that references a symlink stored at a deeper archive path than the hardlink itself. During extraction fallback handling, the symlink was validated at its archived location but recreated at the hardlink's shallower path. This mismatch allowed a relative symlink target that appeared confined during validation to resolve outside the intended extraction directory after recreation. As a result, a malicious archive could create a symlink pointing outside the destination directory. The issue is described as an incomplete fix for CVE-2025-4330.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability tracked as CVE-2026-11940 referenced in an AlmaLinux security advisory/plugin. The content provides scoring metadata, publication dates, and indicates it is associated with CWE-22, but does not describe the flaw in further detail.
A vulnerability tracked as CVE-2026-11940 affecting Rocky Linux 8 Python-related packages, addressed by Rocky Linux advisory RLSA-2026-56219.
A vulnerability listed in the Fedora security notice as one of the referenced CVEs affecting the package update.
A vulnerability tracked as CVE-2026-11940 affecting Oracle Linux 8 platform-python and related Python 3 packages, addressed by an Oracle Linux security update.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.