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.

INFO

Published Date :

2026-03-17T23:24:30.661Z

Last Modified :

2026-03-18T20:18:08.768Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27448 vulnerability.

Vendors Products
Pyca
  • Pyopenssl
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27448.

URL Resource
https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27 cve-icon cve-icon cve-icon
https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0 cve-icon cve-icon cve-icon
https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-27448 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-27448 cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact