CVE-2025-4138 (GCVE-0-2025-4138)

Vulnerability from cvelistv5 – Published: 2025-06-03 12:59 – Updated: 2026-04-21 20:16
VLAI?
Title
Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory
Summary
Allows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata. You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter  for more information. Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected. Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
PSF
References
Impacted products
Vendor Product Version
Python Software Foundation CPython Affected: 0 , < 3.10.18 (python)
Affected: 3.11.0 , < 3.11.13 (python)
Affected: 3.12.0 , < 3.12.11 (python)
Affected: 3.13.0 , < 3.13.4 (python)
Affected: 3.14.0a1 , < 3.14.0b3 (python)
Create a notification for this product.
Credits
Caleb Brown (Google) Petr Viktorin Serhiy Storchaka Hugo van Kemenade Łukasz Langa Thomas Wouters Seth Larson
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See the tarfile  extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter \\u00a0for more information.\\n\\nNote that for Python 3.14 or later the default value of filter=\\u00a0changed from \\\"no filtering\\\" to `\\\"data\\\", so if you are relying on this new default behavior then your usage is also affected.\\n\\nNote that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it\u0027s important to avoid installing source distributions with suspicious links.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eAllows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata.\u003c/span\u003e\u003cbr\u003e\u003c/p\u003e\u003cp\u003eYou are affected by this vulnerability if using the \u003ccode\u003etarfile\u003c/code\u003e\u0026nbsp;module to extract untrusted tar archives using \u003ccode\u003eTarFile.extractall()\u003c/code\u003e\u0026nbsp;or \u003ccode\u003eTarFile.extract()\u003c/code\u003e\u0026nbsp;using the \u003ccode\u003efilter=\u003c/code\u003e\u0026nbsp;parameter with a value of \u003ccode\u003e\\\"data\\\"\u003c/code\u003e\u0026nbsp;or \u003ccode\u003e\\\"tar\\\"\u003c/code\u003e. See the tarfile \u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter\\\"\u003eextraction filters documentation\u003c/a\u003e\u0026nbsp;for more information.\u003c/p\u003e\u003cp\u003e\u003cspan style=\\\"background-color: var(--wht);\\\"\u003eNote that for Python 3.14 or later the default value of \u003c/span\u003e\u003ccode\u003efilter=\u003c/code\u003e\u003cspan style=\\\"background-color: var(--wht);\\\"\u003e\u0026nbsp;changed from \\\"no filtering\\\" to `\\\"data\\\", so if you are relying on this new default behavior then your usage is also affected.\u003c/span\u003e\u003c/p\u003e\u003cp\u003eNote that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it\u0027s important to avoid installing source distributions with suspicious links.\u003cbr\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-22\", \"description\": \"CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"shortName\": \"PSF\", \"dateUpdated\": \"2026-04-21T20:16:04.883Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-4138\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-21T20:16:04.883Z\", \"dateReserved\": \"2025-04-30T13:35:55.675Z\", \"assignerOrgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"datePublished\": \"2025-06-03T12:59:02.717Z\", \"assignerShortName\": \"PSF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.