{"id":"UBUNTU-CVE-2026-102601","details":"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.","modified":"2026-10-01T00:21:06.229502561Z","published":"2026-09-29T16:17:00Z","upstream":["CVE-2026-102601"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-102601"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-102601"},{"type":"REPORT","url":"https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr"},{"type":"REPORT","url":"https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77"},{"type":"REPORT","url":"https://github.com/thephpleague/flysystem/releases/tag/3.35.3"}],"affected":[{"package":{"name":"php-league-flysystem","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/php-league-flysystem?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.15-1","1.0.16-1","1.0.16-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-league-flysystem","binary_version":"1.0.16-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102601.json"}},{"package":{"name":"php-league-flysystem","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/php-league-flysystem?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.3-4"],"ecosystem_specific":{"binaries":[{"binary_name":"php-league-flysystem","binary_version":"1.1.3-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102601.json"}},{"package":{"name":"php-league-flysystem","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/php-league-flysystem?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.10-1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-league-flysystem","binary_version":"1.1.10-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102601.json"}},{"package":{"name":"php-league-flysystem","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/php-league-flysystem?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.29.1-2"],"ecosystem_specific":{"binaries":[{"binary_name":"php-league-flysystem","binary_version":"3.29.1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102601.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}