Improper Neutralization Affecting league/flysystem package, versions <3.35.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-LEAGUEFLYSYSTEM-21203892
- published18 Oct 2026
- disclosed29 Sept 2026
- creditUnknown
Introduced: 29 Sep 2026
NewCVE-2026-102601 (opens in a new tab)How to fix?
Upgrade league/flysystem to version 3.35.3 or higher.
Overview
league/flysystem is a File storage abstraction for PHP
Affected versions of this package are vulnerable to Improper Neutralization in the normalizePath process. An attacker can bypass control character checks by supplying a path containing malformed UTF-8 bytes, which causes the validation to fail silently and allows potentially unsafe paths to be processed.