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Message-ID: <51d4bca4-206d-4e58-9ea9-78806a5493a5@oracle.com>
Date: Wed, 3 Jun 2026 10:50:02 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2026-3276] Potential DoS via quadratic complexity
in unicodedata.normalize()
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-3276] Potential DoS via quadratic
complexity in unicodedata.normalize()
Date: Wed, 3 Jun 2026 14:56:33 +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.
unicodedata.normalize() can take excessive CPU time when processing
specially crafted Unicode input containing long runs of combining characters
with alternating Canonical Combining Class values.
This affects all normalization forms.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-3276
* https://github.com/python/cpython/pull/149080
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