CVE-2026-33691
MEDIUM SEVERITYCVSS Score & Metrics
Base Score
6.8 / 10
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Vulnerability Description
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.
Vulnerability Details
Published Date
Last Modified
CWE ID
CWE-178
Source
NVD
Vendor
coreruleset
Product
coreruleset
External References
- https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02
- https://github.com/coreruleset/coreruleset/pull/4546
- https://github.com/coreruleset/coreruleset/pull/4547
- https://github.com/coreruleset/coreruleset/pull/4548
- https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9
- https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0
- https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w
- http://www.openwall.com/lists/oss-security/2026/03/29/2
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