CVE catalog
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 tha
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.84% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | modsecurity-crs | sid | 3.3.9-1 | fixed |
| Debian | modsecurity-crs | forky | 3.3.9-1 | fixed |
| Debian | modsecurity-crs | trixie | 3.3.7-1+deb13u2 | fixed |
| Debian | modsecurity-crs | trixie-security | 3.3.7-1+deb13u1 | vulnerable |
| Debian | modsecurity-crs | bookworm | 3.3.4-1+deb12u3 | fixed |
| Debian | modsecurity-crs | bookworm-security | 3.3.4-1+deb12u1 | vulnerable |
| Cpe | owasp_modsecurity_core_rule_set | Not reported | 3.3.9 | fixed |
| Cpe | owasp_modsecurity_core_rule_set | Not reported | 4.25.0 | fixed |
| Opensuse | owasp-modsecurity-crs | tumbleweed | 4.29.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | modsecurity-crs | source | sid | 3.3.9-1 | not yet assigned | Not reported | Not reported |
| Debian | modsecurity-crs | source | forky | 3.3.9-1 | not yet assigned | Not reported | Not reported |
| Debian | modsecurity-crs | source | trixie | 3.3.7-1+deb13u2 | not yet assigned | Not reported | Not reported |
| Debian | modsecurity-crs | source | bookworm | 3.3.4-1+deb12u3 | not yet assigned | Not reported | Not reported |
| Cpe | owasp_modsecurity_core_rule_set | cpe | Not reported | 3.3.9 | Not reported | Not reported | Not reported |
| Cpe | owasp_modsecurity_core_rule_set | cpe | Not reported | 4.25.0 | Not reported | Not reported | Not reported |
| Opensuse | owasp-modsecurity-crs | rpm | tumbleweed | 4.29.0-1.1 | Not reported | OPENSUSE-SU-2026:11632-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [modsecurity-crs]Affected
Details (4)
3.3.4-1+deb12u3· all · bookwormFixed · Fixed:
3.3.4-1+deb12u3nvd · modsecurity-crs · debian · bookworm; nvd · modsecurity-crs · debian · 12
3.3.4-1+deb12u3· all · bookwormFixed · Fixed:
3.3.4-1+deb12u3nvd · modsecurity-crs · debian · bookworm; nvd · modsecurity-crs · debian · 12
3.3.4-1+deb12u1· all · bookworm-securityAffected · Fixed:
3.3.4-1+deb12u3nvd · modsecurity-crs · debian · bookworm; nvd · modsecurity-crs · debian · 12
3.3.4-1+deb12u1· all · bookworm-securityAffected · Fixed:
3.3.4-1+deb12u3nvd · modsecurity-crs · debian · bookworm; nvd · modsecurity-crs · debian · 12
[Debian 13 (Trixie)]
- [modsecurity-crs]Affected
Details (4)
3.3.7-1+deb13u2· all · trixieFixed · Fixed:
3.3.7-1+deb13u2nvd · modsecurity-crs · debian · 13
3.3.7-1+deb13u2· all · trixieFixed · Fixed:
3.3.7-1+deb13u2nvd · modsecurity-crs · debian · 13
3.3.7-1+deb13u1· all · trixie-securityAffected · Fixed:
3.3.7-1+deb13u2nvd · modsecurity-crs · debian · 13
3.3.7-1+deb13u1· all · trixie-securityAffected · Fixed:
3.3.7-1+deb13u2nvd · modsecurity-crs · debian · 13
[openSUSE Tumbleweed]
- [owasp-modsecurity-crs-apache2]Unknown
Source package: [owasp-modsecurity-crs]
Details (1)
4.29.0-1.1· noarch · tumbleweedUnknown · Fixed:
4.29.0-1.1Version impact unknown
nvd · owasp-modsecurity-crs · opensuse · tumbleweed
- [owasp-modsecurity-crs]Fixed
Source package: [owasp-modsecurity-crs]
Details (1)
4.29.0-1.1· noarch · tumbleweedFixed · Fixed:
4.29.0-1.1nvd · owasp-modsecurity-crs · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11632-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33691]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33691]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11632-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-33691]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33691.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1812.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]