{"id":"CVE-2026-102601","published":"2026-09-29T16:17:06.343","lastModified":"2026-09-29T16:17:06.343","description":"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 preg_match with the u modifier and treats both false and 0 as falsy. A path containing malformed UTF-8 causes PCRE to return false, so paths that also contain control characters bypass CorruptedPathDetected::forPath() in normalizePath(). Filesystem::write() can store such names and Filesystem::listContents() can return the raw ANSI escape sequences, allowing hidden or spoofed terminal file listings when an administrator displays them. This issue is fixed in version 3.35.3.","cvssScore":3.5,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","cwes":["CWE-150"],"vendors":[],"products":[],"references":[{"url":"https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77","tags":[]},{"url":"https://github.com/thephpleague/flysystem/releases/tag/3.35.3","tags":[]},{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","tags":[]},{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","tags":[]}],"exploitRefs":[{"url":"https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77","tags":[]},{"url":"https://github.com/thephpleague/flysystem/releases/tag/3.35.3","tags":[]},{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","tags":[]},{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","tags":[]}],"hasPoc":true,"ai":null}