Kurz gesagt
- CVE-2026-27448 ist eine Schwachstelle (MITTEL (CVSS 5.3)) in pyopenssl, pyopenssl (pyopenssl).
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.25%, höher als bei 16.5% aller Schwachstellen.
- Abhilfe: auf 26.0.0 oder neuer aktualisieren.
| Package | Affected versions | Patched versions |
|---|
| pyopenssl PyPI | ≥ 0.14, < 26.0.0≥ 0.14.0, < 26.0.0
| 26.0.0
|
| pyopenssl | ≥ 0.14, < 26.0.0
| 26.0.0
|
Description
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.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
NVD 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.
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free