Base64 decoding stops at first padded quad by default
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6epss 0.2%
exploitation probability
0.2%top 91% of all CVEs
observed exploitation
nono source reports it
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.
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
Affected products
Python Software Foundation · CPythonReferences
https://github.com/python/cpython/commit/1f9958f909c1b41a4ffc0b613ef8ec8fa5e7c474https://github.com/python/cpython/commit/4561f6418a691b3e89aef0901f53fe0dfb7f7c0ehttps://github.com/python/cpython/commit/e31c55121620189a0d1a07b689762d8ca9c1b7fahttps://github.com/python/cpython/issues/145264https://github.com/python/cpython/pull/145267https://mail.python.org/archives/list/security-announce@python.org/thread/F5ZT5ICGJ6CKXVUJ34YBVY7WOZ5SHG53/