CVE-2026-115557
Published:October 24, 2026
Updated:October 26, 2026
Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.
Affected Packages
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.11.0a1 <v3.11.18Fix Suggestion:
Update to version v3.11.18https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.14.0a1 <v3.14.10Fix Suggestion:
Update to version v3.14.10https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.12.0a1 <v3.12.16Fix Suggestion:
Update to version v3.12.16https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.13.0a1 <v3.13.18Fix Suggestion:
Update to version v3.13.18https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.15.0a1 <v3.15.2Fix Suggestion:
Update to version v3.15.2Related Resources (18)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Check for Certificate Revocation
EPSS
Base Score:
0.53