CVE-2026-33691The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-178
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
owasp owasp_modsecurity_core_rule_set owasp:owasp_modsecurity_core_rule_set | before 3.3.9; from 4.0.0 before 4.25.0 | NVD |
References
- https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02patch
- https://github.com/coreruleset/coreruleset/pull/4546issue-tracking, patch
- https://github.com/coreruleset/coreruleset/pull/4547issue-tracking, patch
- https://github.com/coreruleset/coreruleset/pull/4548patch
- https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9product, release-notes
- https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0product, release-notes
- https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2wmitigation, patch, vendor-advisory
- http://seclists.org/fulldisclosure/2026/Apr/0mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2026/03/29/2mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2026/04/18/4
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.