UBUNTU-CVE-2026-6104

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Source

https://ubuntu.com/security/CVE-2026-6104

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6104.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6104

Upstream

CVE-2026-6104

Downstream

USN-8336-1

Related

USN-8336-1

Published

2026-05-10T06:16:00Z

Modified

2026-05-28T15:46:29.706518664Z

Severity

6.3 (Medium) CVSS_V4 - 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/RE:M/U:Amber CVSS Calculator
9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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 mbconvertencoding() 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 mbconvertencoding(), mbdetectencoding(), mbconvertvariables(), and mbdetectorder(), as well as the mbstring.detectorder and mbstring.httpoutput INI settings.

References

Affected packages

Ubuntu:25.10 / php8.4

Package

Name: php8.4
Purl: pkg:deb/ubuntu/php8.4?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.4.11-1ubuntu1.2

Affected versions

8.*

8.4.5-1ubuntu1

8.4.8-1ubuntu1

8.4.11-1ubuntu1

8.4.11-1ubuntu1.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "libapache2-mod-php8.4"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "libphp8.4-embed"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-bcmath"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-bz2"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-cgi"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-cli"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-common"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-curl"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-dba"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-enchant"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-fpm"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-gd"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-gmp"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-interbase"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-intl"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-ldap"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-mbstring"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-mysql"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-odbc"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-opcache"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-pgsql"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-phpdbg"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-readline"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-snmp"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-soap"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-sqlite3"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-sybase"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-tidy"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-xml"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-xsl"
        },
        {
            "binary_version": "8.4.11-1ubuntu1.2",
            "binary_name": "php8.4-zip"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6104.json"

Ubuntu:26.04:LTS / php8.5