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CVE-2026-21876

🚨 CRITICAL

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 p...

Published
Jan 08, 2026
Last Modified
Jan 08, 2026
Views
16
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Description

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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 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.

CVSS Scores

CVSS 3.1 9.3
9.3
CRITICAL
CVSS 2.0 9.3

References

github.com github.com github.com github.com github.com

Additional Information

Source
security-advisories@github.com
State
Awaiting analysis

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