{"id":"DEBIAN-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":"2026-09-14T17:03:25.502614556Z","published":"2026-05-10T06:16:07.397Z","upstream":["CVE-2026-6104"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-6104"}],"affected":[{"package":{"name":"php8.4","ecosystem":"Debian:13","purl":"pkg:deb/debian/php8.4?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.21-1~deb13u1"}]}],"versions":["8.4.11-1","8.4.16-1","8.4.16-1~deb13u1","8.4.20-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6104.json"}},{"package":{"name":"php8.4","ecosystem":"Debian:14","purl":"pkg:deb/debian/php8.4?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.21-1"}]}],"versions":["8.4.11-1","8.4.16-1","8.4.16-1~deb13u1","8.4.20-1","8.4.21-1~deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6104.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}