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.

INFO

Published Date :

2026-04-10T18:17:35.045Z

Last Modified :

2026-04-13T16:07:24.229Z

Source :

PSF
AFFECTED PRODUCTS

The following products are affected by CVE-2026-3446 vulnerability.

Vendors Products
Python
  • Cpython
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-3446.

URL Resource
https://github.com/python/cpython/commit/1f9958f909c1b41a4ffc0b613ef8ec8fa5e7c474 cve-icon cve-icon cve-icon
https://github.com/python/cpython/commit/4561f6418a691b3e89aef0901f53fe0dfb7f7c0e cve-icon cve-icon cve-icon
https://github.com/python/cpython/commit/e31c55121620189a0d1a07b689762d8ca9c1b7fa cve-icon cve-icon cve-icon
https://github.com/python/cpython/issues/145264 cve-icon cve-icon cve-icon
https://github.com/python/cpython/pull/145267 cve-icon cve-icon cve-icon
https://mail.python.org/archives/list/[email protected]/thread/F5ZT5ICGJ6CKXVUJ34YBVY7WOZ5SHG53/ cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-3446 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-3446 cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
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Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact