Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding
En bref
Sévérité
MEDIUM 6.3
EPSS
EPSS 0.47 % · centile 40 (2026-10-27)
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
php
Statut NVD
Modified
Description
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.
