tarfile extraction filter bypass allows escaping the destination directory
tarfile.extractall() with the 'data' or 'tar'
filter could be bypassed by a crafted archive where a hardlink
references a symlink stored at a deeper name than the hardlink itself.
The extraction fallback validated the symlink at it's archived location
but recreated it at the hardlink's shallower
path, letting a relative
target the filter judged contained escape the destination directory.
This allowed a malicious tar archive to create a symlink pointing
outside the destination, enabling out-of-destination file reads or
writes. This was an incomplete fix of CVE-2025-4330.
CVE-2026-11940 is recorded against 4 packages.
Published on 30 July 2026 and last revised on 19 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
mail.python.org (Web)
nvd.nist.gov (Web)
github.com (Web)
github.com (Web)
libpython has other advisories on record. If you are patching this one, these are worth checking on the same host:
Details
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| libpython | — | — |
| python | — | — |
| python-min | — | — |
| unknown | — | — |
Similar Threats
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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.
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