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Message-ID: <5b71cca0-984c-4b20-9d2a-2f2b3dc4bb50@oracle.com>
Date: Fri, 10 Apr 2026 18:50:35 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: CPython [CVE-2026-3446] Base64 decoding stops at first
padded quad by default
-------- Forwarded Message --------
Subject: [Security-announce]Title: [CVE-2026-3446] Base64 decoding stops at
first padded quad by default
Date: Fri, 10 Apr 2026 18:19:00 +0000
From: Seth Larson <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
There is a MEDIUM severity vulnerability affecting {project}.
When calling base64.b64decode() or related functions the decoding process would
stop after encountering the first padded quad regardless of whether there was
more information to be processed. This can lead to data being accepted which may
be processed differently by other implementations. Use "strict=True" to enable
stricter processing of base64 data.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-34460
* https://github.com/python/cpython/pull/145267
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