CVE-2026-114101
Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 21, 2026
- Updated
- Oct 28, 2026
- Reserved
- Oct 20, 2026
Description
Coraza before 3.8.1 extracts multipart upload filenames with Go's mime.ParseMediaType, which silently ignores RFC 5987 filename* parameters whose charset is not utf-8 or us-ascii. Unauthenticated attackers can send a decoy filename with filename*=iso-8859-1''shell.php, or filename* alone, so FILES-based rules never see the real name, letting dangerous uploads reach backends that honor filename*.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N | VulnCheck |
| 3.1 | 4.0 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-20 Improper Input Validation
Affected Products
| Product | Versions |
|---|---|
corazacorazawaf |
|
References
- GitHub Security Advisory (GHSA-3wr7-993q-jrff)vendor-advisory
- VulnCheck Advisory: Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypassthird-party-advisory
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