CVE-2026-102601
lowFlysystem is an open source file storage library for PHP.
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77 security-advisories@github.com
- https://github.com/thephpleague/flysystem/releases/tag/3.35.3 security-advisories@github.com
- https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr security-advisories@github.com
- https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr 134c704f-9b21-4f2e-91b3-4a467353bcc0