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Low severityNVD Advisory· Published Mar 17, 2026· Updated Mar 18, 2026

pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback

CVE-2026-27448

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pyopensslPyPI
>= 0.14.0, < 26.0.026.0.0

Affected products

56

Patches

Vulnerability mechanics

References

5

News mentions

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