{"id":"BIT-php-2026-6104","summary":"Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding","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.","aliases":["BIT-libphp-2026-6104","BIT-php-min-2026-6104","CVE-2026-6104"],"modified":"2026-09-10T16:01:45.460709520Z","published":"2026-05-12T08:55:59.545Z","database_specific":{"severity":"Critical","cpes":["cpe:2.3:a:php:php:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/php/php-src/security/advisories/GHSA-74r9-qxhc-fx53"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6104"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22649"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-6104"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2468573"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6104.json"}],"affected":[{"package":{"name":"php","ecosystem":"Bitnami","purl":"pkg:bitnami/php"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.4.0"},{"fixed":"8.4.21"},{"introduced":"8.5.0"},{"fixed":"8.5.6"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/php/BIT-php-2026-6104.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}],"schema_version":"1.9.0"}