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Message-ID: <17526b71-d43a-4fa6-b465-3a6517242ff4@oracle.com>
Date: Mon, 14 Sep 2026 10:56:45 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Cpython: [CVE-2026-82049] tarfile extraction filters
allow file modification and content disclosure via hard link to symlink
-------- 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 <security-announce@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
CC: Stan Ulbrych <stanulbrych@...il.com>
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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