https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 09:57:07 +0000 https://vulnerability.circl.lu/vuln/cve-2026-27448 <p><strong>Affected:</strong> pyca pyopenssl</p> <p>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 `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.</p> <p><strong>Affected:</strong> pyca pyopenssl</p> <p>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 `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.</p> https://vulnerability.circl.lu/vuln/cve-2026-27448 https://vulnerability.circl.lu/vuln/usn-8115-1 <p><strong>Affected:</strong> Ubuntu:22.04:LTS: pyopenssl, Ubuntu:24.04:LTS: pyopenssl, Ubuntu:25.10: pyopenssl</p> <p>It was discovered that pyOpenSSL incorrectly handled exceptions in the tlsext_servername callback. This could result in connections being accepted after an exception, contrary to expectations. (CVE-2026-27448)</p> <p>It was discovered that pyOpenSSL incorrectly handled the DTLS cookie generation callback. If a callback provided cookie values greater than 256 bytes, an attacker could use this issue to cause pyOpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-27459)</p> <p><strong>Affected:</strong> Ubuntu:22.04:LTS: pyopenssl, Ubuntu:24.04:LTS: pyopenssl, Ubuntu:25.10: pyopenssl</p> <p>It was discovered that pyOpenSSL incorrectly handled exceptions in the tlsext_servername callback. This could result in connections being accepted after an exception, contrary to expectations. (CVE-2026-27448)</p> <p>It was discovered that pyOpenSSL incorrectly handled the DTLS cookie generation callback. If a callback provided cookie values greater than 256 bytes, an attacker could use this issue to cause pyOpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-27459)</p> https://vulnerability.circl.lu/vuln/usn-8115-1