CVE-2026-11940 (GCVE-0-2026-11940)

Vulnerability from cvelistv5 – Published: 2026-06-23 16:04 – Updated: 2026-08-13 00:28
VLAI
Title
tarfile extraction filter bypass allows escaping the destination directory
Summary
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.
Severity
7.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-23 17:57 UTC
CWE
Assigner
PSF
References
Impacted products
Vendor Product Version CPE status
Python Software Foundation CPython Affected: 0 , < 3.10.21 (python)
Affected: 3.11.0 , < 3.11.16 (python)
Affected: 3.12.0 , < 3.12.14 (python)
Affected: 3.13.0 , < 3.13.15 (python)
Affected: 3.14.0 , < 3.14.7 (python)
Affected: 3.15.0a1 , < 3.15.0b4 (python)
guessed Create a notification for this product.
Credits
Haruki Oyama (https://github.com/harukioya) Stan Ulbrych (https://github.com/StanFromIreland) Petr Viktorin (https://github.com/encukou)
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This was an incomplete fix of CVE-2025-4330.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cspan\u003etarfile.extractall()\u003c/span\u003e with the \u003cspan\u003e\u0027data\u0027\u003c/span\u003e or \u003cspan\u003e\u0027tar\u0027\u003c/span\u003e\\n filter could be bypassed by a crafted archive where a hardlink \\nreferences a symlink stored at a deeper name than the hardlink itself.\u0026nbsp; \\nThe extraction fallback validated the symlink at it\u0027s archived location \\nbut recreated it at the hardlink\u0027s shallower\u003cbr\u003epath, letting a relative\\n target the filter judged contained escape the destination directory.\u0026nbsp; \\nThis allowed a malicious tar archive to create a symlink pointing \\noutside the destination, enabling out-of-destination file reads or \\nwrites. 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      "cveMetadata": "{\"cveId\": \"CVE-2026-11940\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-13T00:28:51.345Z\", \"dateReserved\": \"2026-06-10T19:50:59.923Z\", \"assignerOrgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"datePublished\": \"2026-06-23T16:04:17.321Z\", \"assignerShortName\": \"PSF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.