CVE-2026-6104

CVE-2026-6104 · Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding

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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.

CVSS 6.3 · Moyenne · EPSS 0,5% · Correctif disponible

Publication

2026-05-10T04:35:17.328Z

Mise à jour

2026-07-15T00:41:42.455Z

Pile logicielle: system · php

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