{"id":"CVE-2026-102601","state":"PUBLISHED","title":"Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter","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.","publishedAt":"2026-09-29T15:26:42.044Z","updatedAt":"2026-09-29T16:02:04.360Z","severity":{"score":3.5,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["thephpleague flysystem"],"affected":[{"vendor":"thephpleague","product":"flysystem","versions":[{"version":"< 3.35.3","status":"affected"}]}],"references":["https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77","https://github.com/thephpleague/flysystem/releases/tag/3.35.3"],"weaknesses":["CWE-150"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/102xxx/CVE-2026-102601.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-102601","state":"PUBLISHED","datePublished":"2026-09-29T15:26:42.044Z","dateUpdated":"2026-09-29T16:02:04.360Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-29T14:18:02.920Z"},"containers":{"cna":{"title":"Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"thephpleague","product":"flysystem","versions":[{"version":"< 3.35.3","status":"affected"}]}],"references":[{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","name":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77","name":"https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77","tags":["x_refsource_MISC"]},{"url":"https://github.com/thephpleague/flysystem/releases/tag/3.35.3","name":"https://github.com/thephpleague/flysystem/releases/tag/3.35.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.5,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-150","lang":"en","description":"CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-29T15:26:42.044Z"},"source":{"advisory":"GHSA-cxf4-7mrp-vvpr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T16:01:15.275868Z","id":"CVE-2026-102601","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-29T16:02:04.360Z"}}]}}}