SB20261106108 - Multiple vulnerabilities in python-certifi

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Main Vulnerability Database SB20261106108

SB20261106108 - Multiple vulnerabilities in python-certifi

Published: November 6, 2026

Security Bulletin ID SB20261106108
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 Certificate Validation (CVE-ID: CVE-2026-117611)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated network attacker to intercept and modify TLS communications accepted by applications using python-certifi.

The vulnerability exists due to python-certifi trusting emSign root certificates whose intermediate certificates were revoked for key compromise when applications validate certificate chains against its root store. An unauthenticated network attacker can use a compromised intermediate certificate authority key to issue certificates and conduct man-in-the-middle attacks against these applications.


Remediation

Install update from vendor's website.

References