RESOLVED FIXED295578
Uint8Array.fromBase64 fails to reject invalid input 
https://bugs.webkit.org/show_bug.cgi?id=295578
Summary Uint8Array.fromBase64 fails to reject invalid input
Nikita Skovoroda
Reported 2025-07-08 01:44:36 PDT
E.g. 'A' (incomplete input), 'A==' (invalid input) `Uint8Array.fromBase64` is shipped and this affects both macOS Safari 18.4 and nightly JSC builds (297100, from https://build.webkit.org/#/builders/1223) https://tc39.es/proposal-arraybuffer-base64/spec/#sec-frombase64 * 10.3, step 10.b.i * 10.3, step 10.e See https://github.com/tc39/test262/pull/4533 for tests
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Radar WebKit Bug Importer
Comment 1 2025-07-08 10:54:09 PDT
<rdar://problem/155346981>
Shu-yu Guo
Comment 2 2025-07-11 18:27:38 PDT
Pull request: https://github.com/WebKit/WebKit/pull/47926
daniel
Comment 3 2025-07-12 10:29:12 PDT
It looks like the bug is upstream, in simdutf, see https://github.com/simdutf/simdutf/pull/822 Will get fixed soon.
EWS
Comment 4 2025-07-14 08:16:06 PDT
Committed 297335@main (c5b50b5798c5): <https://commits.webkit.org/297335@main> Reviewed commits have been landed. Closing PR #47926 and removing active labels.
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