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

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

https://cvefeed.io/rssfeed/latest.atom / Sun, 05/10/2026 - 14:23
CVE ID :CVE-2026-6104
Published : May 10, 2026, 6:16 a.m. | 5 hours, 2 minutes ago
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.
Severity: 6.3 | MEDIUM
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