modsecurity-crs: The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application fire...
CVE-2026-33691 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-33691, released April 2, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mod_security_crs · amzn 2023 | 4.2.0-1.amzn2023.0.3 | ALAS2023-2026-1562 | Apr 13, 2026 |
| modsecurity-crs · Debian 12.15 (bookworm) | 3.3.4-1+deb12u3 | DEBIAN-CVE-2026-33691 | Apr 2, 2026 |
| modsecurity-crs · Debian 13.5 (trixie) | 3.3.7-1+deb13u2 | DEBIAN-CVE-2026-33691 | Apr 2, 2026 |
| modsecurity-crs · Debian 14 | 3.3.9-1 | DEBIAN-CVE-2026-33691 | Apr 2, 2026 |
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