EUVD-2026-21545

| CVE-2026-3446 MEDIUM
2026-04-10 PSF GHSA-8r9f-h969-mm4m
6.0
CVSS 4.0
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CVSS Vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Analysis Generated
Apr 10, 2026 - 18:45 vuln.today
EUVD ID Assigned
Apr 10, 2026 - 18:45 euvd
EUVD-2026-21545
Patch Released
Apr 10, 2026 - 18:45 nvd
Patch available
CVE Published
Apr 10, 2026 - 18:17 nvd
MEDIUM 6.0

Tags

Information Disclosure Cpython

Description

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.

Analysis

CPython's base64.b64decode() function prematurely stops processing after encountering the first padded quad, allowing malformed base64 data to be accepted that may be interpreted differently by other implementations. This affects CPython 3.13.x before 3.13.13, 3.14.x before 3.14.4, and 3.15.0a1 before 3.15.0a8, with authenticated remote attackers on high-complexity networks potentially inducing information disclosure (CVSS 6.0, EPSS risk level moderate). …

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Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +30
POC: 0

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EUVD-2026-21545 vulnerability details – vuln.today
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