All errata/c10f2/ALT-PU-2026-5641-2
ALT-PU-2026-5641-2

Package update python3-module-openssl in branch c10f2

Version23.2.0-alt3
Task#413988
Published2026-04-07
Max severityHIGH
Severity:

Closed issues (4)

CVE-2026-27448
LOW1.7

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.

Published: 2026-03-18Modified: 2026-03-23
CVSS 3.xMEDIUM 5.3
CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 4.0LOW 1.7
CVSS:4.0/CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
CVE-2026-27459
HIGH7.2

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

Published: 2026-03-18Modified: 2026-03-25
CVSS 3.xCRITICAL 9.8
CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0HIGH 7.2
CVSS:4.0/CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
GHSA-5pwr-322w-8jr4
HIGH7.2

pyOpenSSL DTLS cookie callback buffer overflow

Published: 2026-03-16Modified: 2026-03-19
CVSS 4.0HIGH 7.2
CVSS:4.0/CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
References
GHSA-vp96-hxj8-p424
LOW1.7

pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback

Published: 2026-03-16Modified: 2026-03-19
CVSS 4.0LOW 1.7
CVSS:4.0/CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
References