EUVD-2026-88998

Flysystem: WhitespacePathNormalizer's control-character CorruptedPathDetected check is bypassed by malformed UTF-8 in the path, affecting every adapter...

CVE-2026-102601 Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter

Flysystem is an open source file storage library for PHP. Prior to 3.35.3, the default WhitespacePathNormalizer in src/WhitespacePathNormalizer.php used by Filesystem across adapters calls pregmatch with the u modifier and treats both false and 0 as falsy. A path containing malformed UTF-8 causes...

CVE-2026-102601

The Flysystem PHP file storage library is vulnerable in versions prior to 3.35.3 due to a flaw in the WhitespacePathNormalizer component. The root cause is that preg_match with the u modifier treats false (returned during malformed UTF-8 input) as falsy, allowing paths containing control characte...