{"id":"CVE-2026-102601","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102601","generatedAt":"2026-10-28T04:18:16.035Z","title":"A path containing malformed UTF-8 causes PCRE to return false, so paths that also contain control characters bypass CorruptedPathDetected::forPath() in normalizePath().","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.","published":"2026-09-29T16:17:06.000Z","lastModified":"2026-09-30T19:38:27.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":3.5,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N"},"cwe":["CWE-150"],"affected":[],"epss":{"score":0.00337,"percentile":0.26952,"date":"2026-10-27","history":[{"date":"2026-09-30","score":0.00337,"percentile":0.24674}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T16:17:06.000Z","detail":{"score":"3.5","severity":"LOW","publishedAt":"2026-09-29T16:17:06.343Z"},"summary":"New CVE, low severity (CVSS 3.5)."}],"references":[{"url":"https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77","source":"security-advisories@github.com"},{"url":"https://github.com/thephpleague/flysystem/releases/tag/3.35.3","source":"security-advisories@github.com"},{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","source":"security-advisories@github.com"},{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102601","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}