DEBIAN-CVE-2026-6104

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Source

https://security-tracker.debian.org/tracker/CVE-2026-6104

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6104.json

JSON Data

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

Upstream

CVE-2026-6104

Published

2026-05-10T06:16:07Z

Modified

2026-09-14T17:03:25Z

Severity

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

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 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.

References

https://security-tracker.debian.org/tracker/CVE-2026-6104

Affected packages

Debian:13 / php8.4

Package

Name: php8.4
Purl: pkg:deb/debian/php8.4?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.4.21-1~deb13u1

Affected versions

8.*

8.4.11-1

8.4.16-1~deb13u1

8.4.16-1

8.4.20-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6104.json"

Debian:14 / php8.4