Security Bulletin: pyOpenSSL TLS SNI Callback Exception Handling Flaw Allows Security Bypass

Summary pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to settlsextservernamecallback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this...

Important: Red Hat Security Advisory: RHUI 4.11.4 security update - python-pyOpenSSL

An updated version of Red Hat Update Infrastructure RHUI is now available. RHUI 4.11.4 resolves a security vulnerability in pyOpenSSL. Red Hat Update Infrastructure RHUI provides a highly scalable and redundant framework for managing repositories and content. It also allows cloud providers to...

Security update for python-pyOpenSSL

This update for python-pyOpenSSL fixes the following issue: CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST onlineupdate or "zypper patch"...

Critical Photon OS Security Update - PHSA-2026-4.0-1000

Updates of 'python3-pyasn1', 'jq', 'python3-ujson', 'python3-pyOpenSSL' packages of Photon OS have been released...

Security update for python-pyOpenSSL

This update for python-pyOpenSSL fixes the following issue: CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST onlineupdate or "zypper patch"...

SUSE-SU-2026:1416-1 Security update for python-pyOpenSSL

This update for python-pyOpenSSL fixes the following issue: - CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804...

CLSA-2026-1776098295 pyOpenSSL: Fix of CVE-2026-27448

CVE-2026-27448: fix fail-open in settlsextservernamecallback when callback raises exception...

pyOpenSSL: DTLS cookie callback buffer overflow

A flaw was found in pyOpenSSL. The setcookiegeneratecallback callback function can be used to generate DTLS cookies. When the callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can be triggered due to a missing bounds checking before copying the data to a...

openSUSE Security Advisory (SUSE-SU-2026:1192-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

SUSE SLED15 / SLES15 / openSUSE 15 Security Update : python-pyOpenSSL (SUSE-SU-2026:1192-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 / openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1192-1 advisory. - CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. -...

SUSE-SU-2026:1192-1 Security update for python-pyOpenSSL

This update for python-pyOpenSSL fixes the following issues: - CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. - CVE-2026-27459: large cookie value can lead to a buffer overflow bsc1259808...

Critical Photon OS Security Update - PHSA-2026-5.0-92-0802

Updates of 'sqlite', 'python3-pyOpenSSL', 'nghttp2' packages of Photon OS have been released...

SUSE: Security Advisory (SUSE-SU-2026:20930-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

SUSE-SU-2026:20960-1 Security update for python-pyOpenSSL

This update for python-pyOpenSSL fixes the following issues: - CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. - CVE-2026-27459: large cookie value can lead to a buffer overflow bsc1259808...

SUSE-SU-2026:20954-1 Security update for python-pyOpenSSL

This update for python-pyOpenSSL fixes the following issues: - CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. - CVE-2026-27459: large cookie value can lead to a buffer overflow bsc1259808...

Mageia: Security Advisory (MGASA-2026-0074)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

[SECURITY] Fedora 44 Update: pyOpenSSL-26.0.0-1.fc44

High-level wrapper around a subset of the OpenSSL library, includes among oth ers SSL.Connection objects, wrapping the methods of Python's portable sockets Callbacks written in Python Extensive error-handling mechanism, mirroring OpenSSL's error codes...

openSUSE 16 Security Update : python-pyOpenSSL (openSUSE-SU-2026:20419-1)

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20419-1 advisory. - CVE-2026-27448: unhandled exception can result in connection not being cancelled bsc1259804. - CVE-2026-27459: large cookie value can lead to ...

Security update for python-pyOpenSSL (important)

openSUSE security update: security update for python-pyopenssl ------------------------------------------------------------- Announcement ID: openSUSE-SU-2026:20419-1 Rating: important References: bsc1259804 bsc1259808 Cross-References: CVE-2026-27448 CVE-2026-27459 CVSS scores: CVE-2026-27448 SU...

OESA-2026-1729 pyOpenSSL security update

pyOpenSSL is a rather thin wrapper around a subset of the OpenSSL library. With thin wrapper we mean that a lot of the object methods do nothing more than calling a corresponding function in the OpenSSL library. Security Fixes: A security vulnerability exists in the PyOpenSSL library's...