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Message-ID: <07a068d3-9ff4-4647-883f-b9327e1ac2ff@oracle.com>
Date: Tue, 18 Aug 2026 09:09:31 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: CPython [CVE-2026-17084] StringPrep algorithm
considered Unicode codepoint attributes outside Unicode 3.2.0
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-17084] StringPrep algorithm considered
Unicode codepoint attributes outside Unicode 3.2.0
Date: Tue, 18 Aug 2026 13:55:39 +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 CPython.
The "stringprep" module didn't process characters from RFC 3454 tables B.2 or
B.3 correctly: the latest Unicode codepoint attributes were used instead of the
specified Unicode 3.2.0. This behavior would cause mismatches when processing
domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function
of the "stringprep" module. This only affects domain names containing characters
that were not previously registered or had their Unicode attributes such as
case-folding behavior updated since Unicode 3.2.0.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-17084
* https://github.com/python/cpython/pull/155293
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