CorazaWAF Coraza up to 3.8.0 Multipart Upload Filename mime.ParseMediaType filename* unrestricted upload

Summaryinfo

A vulnerability was found in CorazaWAF Coraza up to 3.8.0 and classified as critical. This impacts the function mime.ParseMediaType of the component Multipart Upload Filename. Such manipulation of the argument filename* leads to unrestricted upload. This vulnerability is listed as CVE-2026-114101. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in CorazaWAF Coraza up to 3.8.0. Affected by this issue is the function mime.ParseMediaType of the component Multipart Upload Filename. The manipulation of the argument filename* with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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*.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-114101 since 10/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

Upgrading to version 3.8.1 eliminates this vulnerability.

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Productinfo

Vendor

• CorazaWAF

Name

• Coraza

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8.0

Website

• Product: https://github.com/corazawaf/coraza/

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