Publish GHSA-4xh5-x5gv-qwph

Author: advisory-database[bot]

advisories/github-reviewed/2025/09/GHSA-4xh5-x5gv-qwph/GHSA-4xh5-x5gv-qwph.json

@@ -1,13 +1,13 @@
 {
   "schema_version": "1.4.0",
   "id": "GHSA-4xh5-x5gv-qwph",
-  "modified": "2025-11-03T18:31:43Z",
+  "modified": "2025-12-19T16:46:01Z",
   "published": "2025-09-24T15:31:14Z",
   "aliases": [
     "CVE-2025-8869"
   ],
   "summary": "pip's fallback tar extraction doesn't check symbolic links point to extraction directory",
-  "details": "### Summary\n\nIn the fallback extraction path for source distributions, `pip` used Python’s `tarfile` module without verifying that symbolic/hard link targets resolve inside the intended extraction directory. A malicious sdist can include links that escape the target directory and overwrite arbitrary files on the invoking host during `pip install`.\n\n### Impact\n\nSuccessful exploitation enables arbitrary file overwrite outside the build/extraction directory on the machine running `pip`. This can be leveraged to tamper with configuration or startup files and may lead to further code execution depending on the environment, but the direct, guaranteed impact is integrity compromise on the vulnerable system.\n\n### Conditions\n\nThe issue is triggered when installing an attacker-controlled sdist (e.g., from an index or URL) and the fallback extraction code path is used. No special privileges are required beyond running `pip install`; active user action is necessary.\n\n### Remediation\n\nThe [fix](https://github.com/pypa/pip/pull/13550) is available starting in pip `25.3`. Using a Python interpreter that implements the safe-extraction behavior described by **PEP 706** provides additional defense in depth for other `tarfile` issues but is not a substitute for upgrading pip for this specific flaw.",
+  "details": "When extracting a tar archive pip may not check symbolic links point into the extraction directory if the tarfile module doesn't implement PEP 706. Note that upgrading pip to a \"fixed\" version for this vulnerability doesn't fix all known vulnerabilities that are remediated by using a Python version that implements PEP 706. Note that this is a vulnerability in pip's fallback implementation of tar extraction for Python versions that don't implement PEP 706 and therefore are not secure to all vulnerabilities in the Python 'tarfile' module. If you're using a Python version that implements PEP 706 then pip doesn't use the \"vulnerable\" fallback code. Mitigations include upgrading to a version of pip that includes the fix, upgrading to a Python version that implements PEP 706 (Python >=3.9.17, >=3.10.12, >=3.11.4, or >=3.12), applying the linked patch, or inspecting source distributions (sdists) before installation as is already a best-practice.",
   "severity": [
     {
       "type": "CVSS_V4",