DEBIAN-CVE-2026-6104
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.
DEBIAN-CVE-2026-6104
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-6104
php8.4
Source reference: /affected/0/package/name
- Affected versions
- 8.4.11-1
Source reference:
/affected/0/versions8.4.16-1Source reference:
/affected/0/versions8.4.16-1~deb13u1Source reference:
/affected/0/versions8.4.20-1Source reference:
/affected/0/versions - Fixed versions
- 8.4.21-1~deb13u1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
php8.4
Source reference: /affected/1/package/name
- Affected versions
- 8.4.11-1
Source reference:
/affected/1/versions8.4.16-1Source reference:
/affected/1/versions8.4.16-1~deb13u1Source reference:
/affected/1/versions8.4.20-1Source reference:
/affected/1/versions8.4.21-1~deb13u1Source reference:
/affected/1/versions - Fixed versions
- 8.4.21-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4.21-1~deb13u1"
}
]
}
],
"package": {
"name": "php8.4",
"purl": "pkg:deb/debian/php8.4?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"8.4.11-1",
"8.4.16-1",
"8.4.16-1~deb13u1",
"8.4.20-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6104.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4.21-1"
}
]
}
],
"package": {
"name": "php8.4",
"purl": "pkg:deb/debian/php8.4?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"8.4.11-1",
"8.4.16-1",
"8.4.16-1~deb13u1",
"8.4.20-1",
"8.4.21-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6104.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58072 · Revision 1
- Added to Heist Feed
- Publisher date