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Message-ID: <0e931e7e-5d38-471e-b46f-9173a8ce461b@oracle.com>
Date: Thu, 22 Oct 2026 15:46:13 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: CPython: [CVE-2026-114583] tarfile.tar_filter path
traversal bypass allows writing outside the extraction directory
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-114583] tarfile.tar_filter path traversal
bypass allows writing outside the extraction directory
Date: Thu, 22 Oct 2026 21:35:28 +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 MEDIUM severity vulnerability affecting CPython.
tarfile.tar_filter could be bypassed using crafted link entries, including
symlinks with empty or directory-like names, to redirect later archive members
outside the intended extraction directory. This allowed a malicious tar archive
to cause tarfile.extractall() with filter="tar" to write files outside the
destination directory, subject to the permissions of the extracting process.
This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered
tarfile.data_filter.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-114583
* https://github.com/python/cpython/pull/160098
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