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Message-ID: <e2ea05d6-55c1-4ebc-9342-953609f90593@oracle.com>
Date: Fri, 16 May 2025 09:10:17 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: CPython CVE-2025-4516: Use-after-free crash using
bytes.decode("unicode_escape", error="ignore|replace")
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2025-4516] Use-after-free crash using
bytes.decode("unicode_escape", error="ignore|replace")
Date: Thu, 15 May 2025 09:33:30 -0400
From: Seth Larson <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
There is a MEDIUM severity security issue in CPython when using
`bytes.decode("unicode_escape", error="ignore|replace")`. The use-after-free
being exploited would likely result in a crash.
If you are not using the "unicode_escape" encoding or an error handler your
usage is not affected. To work-around this issue you may stop using the error=
handler and instead wrap the bytes.decode() call in a try-except catching the
decoding error.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2025-4516
* https://github.com/python/cpython/pull/129648
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