Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter — GHSA-CXF4-7MRP-VVPR

Summary

## Related public issue (context, not a duplicate) Closed issue #1429 ("Handle non-UTF-8 paths", 2024-03-24) raised exactly this general concern and even suggested detection via `preg_match('//u', $path) !== 1` -- note the reporter's suggested check explicitly compares `!== 1`, which *would* correctly treat PCRE's `false` return as "reject." The maintainer's reply pointed to the `PathNormalizer` interface as the…

Timeline

Published by source

2026-09-29

Risk context

• Reported severity or threat level: low.
• Reported CVSS score: 3.5 out of 10.
• Review exposure for the affected product or family: composer: league/flysystem.

Product

composer: league/flysystem

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-CXF4-7MRP-VVPR

Source

GitHub

Vendor

GitHub

Published by source

2026-09-29

Last source activity

2026-09-29

Additional identifiers

CVE-2026-102601

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.