{"id":"UBUNTU-CVE-2026-6104","details":"In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded NUL byte is passed to mb_convert_encoding() or related mbstring functions, the code incorrectly assumes that when strncasecmp() returns 0 it means the strings have the same length. This can lead to out-of-bounds read of global memory, potentially causing a crash or information disclosure or crash. Affected functions include mb_convert_encoding(), mb_detect_encoding(), mb_convert_variables(), and mb_detect_order(), as well as the mbstring.detect_order and mbstring.http_output INI settings.","modified":"2026-06-30T18:17:35.192959508Z","published":"2026-05-10T06:16:00Z","related":["USN-8336-1"],"upstream":["CVE-2026-6104"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6104"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-6104"},{"type":"REPORT","url":"https://github.com/php/php-src/security/advisories/GHSA-74r9-qxhc-fx53"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8336-1"}],"affected":[{"package":{"name":"php8.4","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/php8.4?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.11-1ubuntu1.2"}]}],"versions":["8.4.5-1ubuntu1","8.4.8-1ubuntu1","8.4.11-1ubuntu1","8.4.11-1ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libapache2-mod-php8.4","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"libphp8.4-embed","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4"},{"binary_name":"php8.4-bcmath","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-bz2","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-cgi","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-cli","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-common","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-curl","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-dba","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-enchant"},{"binary_name":"php8.4-fpm","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-gd","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-gmp","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-interbase"},{"binary_name":"php8.4-intl","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-ldap"},{"binary_name":"php8.4-mbstring","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-mysql","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-odbc"},{"binary_name":"php8.4-opcache","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-pgsql","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-phpdbg"},{"binary_name":"php8.4-readline","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-snmp","binary_version":"8.4.11-1ubuntu1.2"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-soap"},{"binary_version":"8.4.11-1ubuntu1.2","binary_name":"php8.4-sqlite3"},{"binary_name":"php8.4-sybase","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-tidy","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-xml","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-xsl","binary_version":"8.4.11-1ubuntu1.2"},{"binary_name":"php8.4-zip","binary_version":"8.4.11-1ubuntu1.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6104.json"}},{"package":{"name":"php8.5","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/php8.5?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.4-0ubuntu1.1"}]}],"versions":["8.5.2-0ubuntu1","8.5.4-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libapache2-mod-php8.5","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"libphp8.5-embed","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-bcmath","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-bz2","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-cgi","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-cli","binary_version":"8.5.4-0ubuntu1.1"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-common"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-curl"},{"binary_name":"php8.5-dba","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-enchant","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-fpm","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-gd","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-gmp","binary_version":"8.5.4-0ubuntu1.1"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-interbase"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-intl"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-ldap"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-litespeed"},{"binary_name":"php8.5-mbstring","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-mysql","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-odbc","binary_version":"8.5.4-0ubuntu1.1"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-pgsql"},{"binary_name":"php8.5-phpdbg","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-readline","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-snmp","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-soap","binary_version":"8.5.4-0ubuntu1.1"},{"binary_version":"8.5.4-0ubuntu1.1","binary_name":"php8.5-sqlite3"},{"binary_name":"php8.5-sybase","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-tidy","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-xml","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-xsl","binary_version":"8.5.4-0ubuntu1.1"},{"binary_name":"php8.5-zip","binary_version":"8.5.4-0ubuntu1.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6104.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L/RE:M/U:Amber"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}