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 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.
INFO
Published Date :
2026-01-08T13:55:37.102Z
Last Modified :
2026-01-08T15:55:33.073Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-21876 vulnerability.
| Vendors | Products |
|---|---|
| Owasp |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21876.
