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Message-ID: <6fe5801a-70f8-4c72-89b3-f46677602b07@oracle.com>
Date: Thu, 9 Jul 2026 10:40:24 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2026-15308] Incremental HTMLParser allows
CPU-exhaustion DoS via repeated unterminated markup declarations
https://www.cve.org/CVERecord?id=CVE-2026-15308 currently lists all
versions before Python 3.15.0 as affected.
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-15308] Incremental HTMLParser allows CPU-exhaustion DoS via repeated unterminated markup declarations
Date: Thu, 9 Jul 2026 17:08:21 +0000
From: Seth Larson <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
There is a HIGH severity vulnerability affecting CPython.
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-15308
* https://github.com/python/cpython/pull/153031
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