CVE-2026-3446
Published:April 10, 2026
Updated:April 23, 2026
When calling base64.b64decode() or related functions the decoding process would stop after encountering the first padded quad regardless of whether there was more information to be processed. This can lead to data being accepted which may be processed differently by other implementations. Use "validate=True" to enable stricter processing of base64 data.
Affected Packages
https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.13.0 <v3.13.13Fix Suggestion:
Update to version v3.13.13https://github.com/python/cpython.git (GITHUB):
Affected version(s) >=v3.14.0 <v3.14.4Fix Suggestion:
Update to version v3.14.4https://github.com/python/cpython.git (GITHUB):
Affected version(s) =v3.15.0a8 <v3.15.0a8Fix Suggestion:
Update to version v3.15.0a8Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Insufficient Verification of Data Authenticity
EPSS
Base Score:
0.02
