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Title: [3.13] gh-145264: Do not ignore excess Base64 data after the first padded quad (GH-145267) (GH-146326) by miss-islington · Pull Request #146348 · python/cpython · GitHub

Open Graph Title: [3.13] gh-145264: Do not ignore excess Base64 data after the first padded quad (GH-145267) (GH-146326) by miss-islington · Pull Request #146348 · python/cpython

X Title: [3.13] gh-145264: Do not ignore excess Base64 data after the first padded quad (GH-145267) (GH-146326) by miss-islington · Pull Request #146348 · python/cpython

Description: Base64 decoder (see binascii.a2b_base64(), base64.b64decode(), etc) no longer ignores excess data after the first padded quad in non-strict (default) mode. Instead, in conformance with RFC 4648, it ignores the pad character, "=", if it is present before the end of the encoded data. (cherry picked from commit 4561f64) (cherry picked from commit e31c551) Co-authored-by: Serhiy Storchaka storchaka@gmail.com Issue: gh-145264

Open Graph Description: Base64 decoder (see binascii.a2b_base64(), base64.b64decode(), etc) no longer ignores excess data after the first padded quad in non-strict (default) mode. Instead, in conformance with RFC 4648, i...

X Description: Base64 decoder (see binascii.a2b_base64(), base64.b64decode(), etc) no longer ignores excess data after the first padded quad in non-strict (default) mode. Instead, in conformance with RFC 4648, i...

Opengraph URL: https://github.com/python/cpython/pull/146348

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bd4ab52 [3.14] gh-145264: Do not ignore excess Base64 data after the first pa… serhiy-storchaka Mar 23, 2026 https://github.com/python/cpython/pull/146348/commits/bd4ab523ba664863d40470cc718c566158adfa31
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