CVE-2026-3446
Medium
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.
SeverityMedium
CVSS6.0
Exploit probability—
ProductCPython
PublishedApr 10, 2026
First seenApr 10, 2026
Weakness typeCWE-345CWE-345
How to fix
Update
- Python Software Foundation CPython3.13.13, 3.14.4, 3.15.0a8 or later
Patches
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Python Software Foundation CPython | v < 3.13.13, 3.14.0 ≤ v < 3.14.4, 3.15.0a1 ≤ v < 3.15.0a8 | 3.13.13, 3.14.4, 3.15.0a8 |
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