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Message-ID: <e94244d0-2c93-4c1f-b198-e7afffa31047@oracle.com>
Date: Mon, 9 Nov 2026 11:03:09 -0800
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: CPython: [CVE-2026-19552]
ssl.get_server_certificate(addr, ca_certs=...) verifies the chain but never
the identity
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-19552] ssl.get_server_certificate(addr, ca_certs=...) verifies the chain but never the identity
Date: Mon, 9 Nov 2026 14:12:16 +0000
From: Seth Larson <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
There is a LOW severity vulnerability affecting CPython.
When ca_certs parameter was supplied to ssl.get_server_certificate() function, the identity of the certificate is not checked.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-19552
* https://github.com/python/cpython/pull/161507
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