-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-82049] tarfile extraction filters allow
file modification and content disclosure via hard link to symlink
Date: Mon, 14 Sep 2026 17:59:38 +0100
From: Stan Ulbrych via Security-announce <[email protected]>
Reply-To: [email protected]
To: [email protected]
CC: Stan Ulbrych <[email protected]>
There is a HIGH severity vulnerability affecting CPython.
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.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-82049
* https://github.com/python/cpython/pull/157192
--
Stan Ulbrych (https://stan.ulbrych.org <https://stan.ulbrych.org>)
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