CVE-2026-19553

ssl.SSLContext.wrapbio didn't require the serverhostname argument to not be None if ssl.SSLContext.checkhostname was set. Due to a missing parameter check in SSLObject, if the serverhostname argument isn't supplied then hostname verification would be silently skipped. This defect could lead to...

CVE-2026-19553 SSLContext.wrap_bio() missing validation of server_hostname parameter

ssl.SSLContext.wrapbio didn't require the serverhostname argument to not be None if ssl.SSLContext.checkhostname was set. Due to a missing parameter check in SSLObject, if the serverhostname argument isn't supplied then hostname verification would be silently skipped. This defect could lead to...

PSF-2026-44

ssl.SSLContext.wrapbio didn't require the serverhostname argument to not be None if ssl.SSLContext.checkhostname was set. Due to a missing parameter check in SSLObject, if the serverhostname argument isn't supplied then hostname verification would be silently skipped. This defect could lead to...

CVE-2026-19553

ssl.SSLContext.wrapbio didn't require the serverhostname argument to not be None if ssl.SSLContext.checkhostname was set. Due to a missing parameter check in SSLObject, if the serverhostname argument isn't supplied then hostname verification would be silently skipped. This defect could lead to...

CVE-2026-19553

The Python ssl.SSLContext.wrap_bio() method fails to require a non-None server_hostname argument even when ssl.SSLContext.check_hostname is enabled. Due to a missing parameter check in SSLObject , omitting the server_hostname argument causes certificate hostname verification to be silently skippe...