CVE search · CVE-2026-6104
CVE-2026-6104
medium 6.3
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
- Status
- Modified
- Published
- Last changed
- Source
- security@php.net
- Weakness
- CWE-125
Severity
| Version | Score | Vector | Source |
|---|---|---|---|
| CVSS 4.0 | medium 6.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:M/U:Amber |
security@php.netSecondary |
| CVSS 3.1 | critical 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
nvd@nist.govPrimary |
| CVSS 3.1 | high 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
0b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary |
Affected products
Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.
- php · php
References
- https://github.com/php/php-src/security/advisories/GHSA-74r9-qxhc-fx53Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:22649
- https://access.redhat.com/security/cve/CVE-2026-6104
- https://bugzilla.redhat.com/show_bug.cgi?id=2468573
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6104.json