DEBIAN-CVE-2026-33691

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Source
https://security-tracker.debian.org/tracker/CVE-2026-33691
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-33691
Upstream
  • CVE-2026-33691
Published
2026-04-02T16:16:22.593Z
Modified
2026-04-28T20:31:38.939795Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:11 / modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/debian/modsecurity-crs?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3.0-1
3.3.0-1+deb11u1
3.3.2-1
3.3.4-1~deb11u1
3.3.4-1~deb11u2
3.3.4-1
3.3.5-1
3.3.5-2
3.3.6-1
3.3.7-1
3.3.8-1
3.3.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"

Debian:12 / modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/debian/modsecurity-crs?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3.4-1
3.3.4-1+deb12u1
3.3.4-1+deb12u2
3.3.5-1
3.3.5-2
3.3.6-1
3.3.7-1
3.3.8-1
3.3.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"

Debian:13 / modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/debian/modsecurity-crs?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3.7-1
3.3.7-1+deb13u1
3.3.8-1
3.3.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"

Debian:14 / modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/debian/modsecurity-crs?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.3.9-1

Affected versions

3.*
3.3.7-1
3.3.8-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33691.json"