CRITICALVulnerability
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NVD CRITICAL: CVE-2026-6104 — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding nam...

·Source: NIST NVD

Updated:

Executive Summary

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 cra

Analysis

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 Score: 9.1. Published: 2026-05-10T06:16:07.397.

Indicators of Compromise (1)

CVE (1)
CVE-2026-6104
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 10, 2026. Verified by: NIST.

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