CVE catalog
CVE-2026-102601
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
- Severity
- Low · CVSS 3.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | php-league-flysystem | sid | 3.36.0-1 | fixed |
| Debian | php-league-flysystem | forky | 3.29.1-2 | vulnerable |
| Debian | php-league-flysystem | trixie | 3.29.1-2 | vulnerable |
| Debian | php-league-flysystem | bookworm | 1.1.10-1 | vulnerable |
| Composer | league/flysystem | Not reported | 3.35.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | php-league-flysystem | source | sid | 3.36.0-1 | not yet assigned | Not reported | [1149886] |
| Debian | php-league-flysystem | source | forky | (unfixed) | not yet assigned | Not reported | [1149886] |
| Debian | php-league-flysystem | source | trixie | (unfixed) | not yet assigned | Not reported | [1149886] |
| Debian | php-league-flysystem | source | bookworm | (unfixed) | not yet assigned | Not reported | [1149886] |
| Composer | league/flysystem | composer | Not reported | 3.35.3 | Not reported | GHSA-CXF4-7MRP-VVPR | Not reported |
Notes
[trixie] php-league-flysystem: Minor issue [bookworm] php-league-flysystem: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [php-league-flysystem]Affected
Details (2)
1.1.10-1· all · bookwormAffected
nvd · php-league-flysystem · debian · bookworm; nvd · php-league-flysystem · debian · 12
1.1.10-1· all · bookwormAffected
nvd · php-league-flysystem · debian · bookworm; nvd · php-league-flysystem · debian · 12
[Debian 13 (Trixie)]
- [php-league-flysystem]Affected
Details (2)
3.29.1-2· all · trixieAffected
nvd · php-league-flysystem · debian · 13
3.29.1-2· all · trixieAffected
nvd · php-league-flysystem · debian · 13
Observed:
References
- [https://github.com/advisories/GHSA-cxf4-7mrp-vvpr]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-102601]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-102601]
- [https://security-tracker.debian.org/tracker/CVE-2026-102601]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]