tarfile extraction filters allow file modification and content disclosure via hard link to symlink
In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-82049US | — | — | ||
In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may ca… | ||||
02
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/09/14/27WEB
- https://github.com/python/cpython/commit/197663d63afed27f66e10e23c194e8a634e60913WEB
- https://github.com/python/cpython/commit/28f315486b3da0352b9a1de1c3c97f4127ba4771WEB
- https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daecaWEB
- https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3WEB
- https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0dWEB
- https://github.com/python/cpython/commit/c66df4e70435d257fd488b35ea129c6f317433a8WEB
- https://github.com/python/cpython/commit/cc1689830c6b9aaddded2fb9f2fe8116867e2c0eWEB
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