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2 vulnerabilities by coreruleset
CVE-2026-33691 (GCVE-0-2026-33691)
Vulnerability from cvelistv5 – Published: 2026-04-02 15:03 – Updated: 2026-04-03 05:33
VLAI?
Title
OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks
Summary
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.
Severity ?
6.8 (Medium)
CWE
- CWE-178 - Improper Handling of Case Sensitivity
Assigner
References
| URL | Tags | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| coreruleset | coreruleset |
Affected:
< 3.3.9
Affected: >= 4.0.0-rc1, < 4.25.0 |
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CVE-2026-21876 (GCVE-0-2026-21876)
Vulnerability from cvelistv5 – Published: 2026-01-08 13:55 – Updated: 2026-04-09 15:41
VLAI?
Title
OWASP CRS has multipart bypass using multiple content-type parts
Summary
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.
Severity ?
9.3 (Critical)
CWE
- CWE-794 - Incomplete Filtering of Multiple Instances of Special Elements
Assigner
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| coreruleset | coreruleset |
Affected:
< 4.22.0
Affected: < 3.3.8 |
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