SB2026081870 - Improper handling of exceptional conditions in pyopenssl

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Main Vulnerability Database SB2026081870

SB2026081870 - Improper handling of exceptional conditions in pyopenssl

Published: August 18, 2026

Security Bulletin ID SB2026081870
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper handling of exceptional conditions (CVE-ID: CVE-2026-27448)

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass security-sensitive behavior.

The vulnerability exists due to improper exception handling in set_tlsext_servername_callback callbacks when handling TLS connections. A remote attacker can trigger an unhandled exception in a user-provided callback to bypass security-sensitive behavior.

Exploitation is possible only if an application relies on this callback for security-sensitive decisions.


Remediation

Install update from vendor's website.

References