CVE-2026-114101: Improper Input Validation in corazawaf coraza
Description
CVE-2026-114101 is a medium severity vulnerability in Coraza before version 3.8.1. It involves improper input validation during multipart upload filename extraction, where the software uses Go's mime.ParseMediaType which ignores RFC 5987 filename* parameters with charsets other than utf-8 or us-ascii. This allows unauthenticated attackers to craft filenames that bypass FILES-based security rules, potentially enabling dangerous uploads to reach backend systems that honor the filename* parameter.
CVSS v4.0
Score 6.3medium
Affected software
corazawaf
coraza
pkg:golang/github.com/corazawaf/corazaRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Coraza versions prior to 3.8.1 extract multipart upload filenames using Go's mime.ParseMediaType function. This function silently ignores RFC 5987 filename* parameters if their charset is not utf-8 or us-ascii. Attackers can exploit this by sending a decoy filename with a filename* parameter using a charset like iso-8859-1, or by sending filename* alone. As a result, FILES-based security rules do not see the actual filename, allowing malicious uploads to bypass detection and reach backend systems that process the filename* parameter.
Potential Impact
The vulnerability allows unauthenticated attackers to bypass FILES-based security rules by manipulating multipart upload filenames. This can lead to dangerous files being uploaded and processed by backend systems that honor the filename* parameter, potentially resulting in unauthorized file uploads or execution of malicious files.
Mitigation Recommendations
A fix is available in Coraza version 3.8.1. Users should upgrade to version 3.8.1 or later to address this vulnerability. No additional mitigation steps are indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-20T21:47:43.312Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad80c082cdf04f6568caa53
Added to database: 10/21/2026, 00:49:12 UTC
Last enriched: 10/21/2026, 01:04:15 UTC
Last updated: 10/21/2026, 01:28:22 UTC
Views: 3
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