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🛡️ CVE-2026-11940 — libpython

🟠 CVSS 8.0 — High ✅ No Known Exploit NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Affected software

CVE-2026-11940 is recorded against 4 packages.

  • libpython
  • python
  • python-min
  • unknown

Timeline and source

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.

References

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)

Other advisories for this package

libpython has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-07-30
Updated 2026-08-20
Modified 2026-08-19
Fix URL N/A

Affected Packages

Software From version Fixed in
libpython
python
python-min
unknown

References

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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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