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Critical 9.1 CVSS 3.1 PHP Published on 2026-05-10

In PHP versions 8.4. before 8.4.21 and 8.5.

CVECVE-2026-6104 GHSANo GHSA advisory
View at the source View JSON Last modified at the source: 2026-07-24

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.

Original text by NVD (NIST), public domain.

CVSS metrics 3.1

Source: security@php.net · secondary
Critical 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vectorNetwork
ComplexityLow
Attack requirementsPresent
Privileges requiredNone
User interactionNone
Confidentiality (system)Low
Integrity (system)None
Availability (system)Low
Confidentiality (others)Low
Integrity (others)None
Availability (others)Low

References

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