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CVE-2026-102601 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.5 LOWVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr	CISA-ADP
https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77	[email protected]
https://github.com/thephpleague/flysystem/releases/tag/3.35.3	[email protected]
https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-150	Improper Neutralization of Escape, Meta, or Control Sequences	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 29, 2026	New CVE Received	[email protected]
Sep 29, 2026	CVE Modified	CISA-ADP