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.
Weakness
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Hardened Images | RedHat | python3-12-main-3.12.13-3.1.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-13-main-3.13.13-1.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-14-main-3.14.4-1.hum1 | * |
| Python2.7 | Ubuntu | esm-infra/xenial | * |
| Python3.10 | Ubuntu | jammy | * |
| Python3.12 | Ubuntu | noble | * |
| Python3.13 | Ubuntu | upstream | * |
| Python3.14 | Ubuntu | upstream | * |
| Python3.5 | Ubuntu | esm-infra/xenial | * |
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/111.html
- https://cwe.mitre.org/data/definitions/141.html
- https://cwe.mitre.org/data/definitions/142.html
- https://cwe.mitre.org/data/definitions/148.html
- https://cwe.mitre.org/data/definitions/218.html
- https://cwe.mitre.org/data/definitions/384.html
- https://cwe.mitre.org/data/definitions/385.html
- https://cwe.mitre.org/data/definitions/386.html
- https://cwe.mitre.org/data/definitions/387.html
- https://cwe.mitre.org/data/definitions/388.html
- https://cwe.mitre.org/data/definitions/665.html
- https://cwe.mitre.org/data/definitions/701.html
References
- https://github.com/python/cpython/commit/1f9958f909c1b41a4ffc0b613ef8ec8fa5e7c474
- https://github.com/python/cpython/commit/4561f6418a691b3e89aef0901f53fe0dfb7f7c0e
- https://github.com/python/cpython/commit/e31c55121620189a0d1a07b689762d8ca9c1b7fa
- https://github.com/python/cpython/issues/145264
- https://github.com/python/cpython/pull/145267
- https://mail.python.org/archives/list/security-announce@python.org/thread/F5ZT5ICGJ6CKXVUJ34YBVY7WOZ5SHG53/