DEBIAN-CVE-2026-33691
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.
DEBIAN-CVE-2026-33691
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-2026-33691
modsecurity-crs
Source reference: /affected/0/package/name
- Affected versions
- 3.3.4-1
Source reference:
/affected/0/versions3.3.4-1+deb12u1Source reference:
/affected/0/versions3.3.4-1+deb12u2Source reference:
/affected/0/versions - Fixed versions
- 3.3.4-1+deb12u3
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
modsecurity-crs
Source reference: /affected/1/package/name
- Affected versions
- 3.3.7-1
Source reference:
/affected/1/versions3.3.7-1+deb13u1Source reference:
/affected/1/versions - Fixed versions
- 3.3.7-1+deb13u2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
modsecurity-crs
Source reference: /affected/2/package/name
- Affected versions
- 3.3.7-1
Source reference:
/affected/2/versions3.3.8-1Source reference:
/affected/2/versions - Fixed versions
- 3.3.9-1
Source reference:
/affected/2/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": "3.3.4-1+deb12u3"
}
]
}
],
"package": {
"name": "modsecurity-crs",
"purl": "pkg:deb/debian/modsecurity-crs?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.3.4-1",
"3.3.4-1+deb12u1",
"3.3.4-1+deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.7-1+deb13u2"
}
]
}
],
"package": {
"name": "modsecurity-crs",
"purl": "pkg:deb/debian/modsecurity-crs?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.3.7-1",
"3.3.7-1+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.9-1"
}
]
}
],
"package": {
"name": "modsecurity-crs",
"purl": "pkg:deb/debian/modsecurity-crs?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.3.7-1",
"3.3.8-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56827 · Revision 1
- Added to Heist Feed
- Publisher date