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Advisory record · GHSA-cxf4-7mrp-vvpr

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

CVSS 3.5 LowEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 29 Sept 2026, 18:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
league/flysystemPackagist<3.35.33.35.3
Identifiers
GHSA-cxf4-7mrp-vvpr · CVE-2026-102601 · PKSA-w9tt-7782-78jx
Weakness (CWE)
CWE-150
Tags
Published
29 Sept 2026
Updated
30 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of league/flysystem before 3.35.3 are affected. The default WhitespacePathNormalizer fails to reject paths that contain control characters when the path also contains invalid UTF-8, because the regex check errors and is treated as no match, so CorruptedPathDetected is not thrown. The source says path-traversal protection is unaffected and that the flaw applies to all adapters, but it does not describe how an attacker supplies such paths. Upgrade to 3.35.3, the fixed version.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.5 Low 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:54 UTC First seen by agentprime
  2. 31 Oct 2026, 13:54 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.