VDB
DEBIAN-CVE-2026-21876
DEBIAN-CVE-2026-21876
PUBLISHED
CVSS 5.300000190734863 MEDIUM
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.
Risk Scores
CVSS v3.1
5.300000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:11 | modsecurity-crs | 3.3.0-1, 3.3.0-1+deb11u1, 3.3.2-1 |
| Debian:14 | modsecurity-crs | 3.3.7-1, 3.3.7-1, 0 |
| Debian:13 | modsecurity-crs | 3.3.7-1, 0, 3.3.7-1 |
| Debian:12 | modsecurity-crs | 0, 3.3.4-1, 0 |
Timeline
- Jan 8, 2026 CVE Published
- Apr 28, 2026 CVE Updated