🛡️ UBUNTU-CVE-2026-6104
⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-10
Updated 2026-06-02
Modified N/A
Fix URL N/A

Affected Packages

Software From version Fixed in
php5 — —
php7.0 — —
php7.2 — —
php7.4 — —
php8.1 — —
php8.3 — —
php8.4 — 8.4.11-1ubuntu1.2
php8.5 — 8.5.4-0ubuntu1.1

References

N/A

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