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CVE-2026-3446

Published: Apr 10, 2026

Modified: Apr 13, 2026

PUBLISHED

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.

Vendor	Product	Versions
Python Software Foundation	CPython	affected `0 - < 3.13.13` affected `3.14.0 - < 3.14.4` affected `3.15.0a1 - < 3.15.0a8`

References

https://github.com/python/cpython/pull/145267

patch

https://github.com/python/cpython/issues/145264

issue-tracking

https://mail.python.org/archives/list/[email protected]/thread/F5ZT5ICGJ6CKXVUJ34YBVY7WOZ5SHG53/

vendor-advisory

https://github.com/python/cpython/commit/1f9958f909c1b41a4ffc0b613ef8ec8fa5e7c474

patch

https://github.com/python/cpython/commit/4561f6418a691b3e89aef0901f53fe0dfb7f7c0e

patch

https://github.com/python/cpython/commit/e31c55121620189a0d1a07b689762d8ca9c1b7fa

patch

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