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CVE-2026-27448
Published: Mar 17, 2026
Modified: Mar 18, 2026
PUBLISHED
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.
| Vendor | Product | Versions |
|---|---|---|
pyca | pyopenssl | affected >= 0.14.0, < 26.0.0 |
Weaknesses (CWE)
References
https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424
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