CWE-794
Incomplete Filtering of Multiple Instances of Special Elements
VariantIncomplete
Description
The product receives data from an upstream component, but does not filter all instances of a special element before sending it to a downstream component.
Hierarchy (View 1000)
Parents
Children
none
CVEs mapped to this weakness (1)
| CVE | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|
| CVE-2026-21876 | Cri | 0.57 | 9.3 | 0.04 | Jan 8, 2026 | 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. |