CVE-2026-41508

MEDIUM 5.8

OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling

CVSS Score

5.8

EPSS Score

0.0%

EPSS Percentile

0th

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.4.0 until 3.8.0, the multipart processor in internal/bodyprocessors/multipart.go treats io.ErrUnexpectedEOF as nonfatal without setting MULTIPART_STRICT_ERROR. A remote attacker can submit a truncated multipart body that produces io.ErrUnexpectedEOF, causing parsing to stop without raising the strict-error signal used by the recommended defensive rule. Rules 200002 and 200003 do not fire, allowing multipart parser-disagreement payloads to reach a backend that interprets the truncated body differently. This issue is fixed in version 3.8.0.

CWE	CWE-693 CWE-755
Vendor	corazawaf
Product	coraza
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

corazawaf / coraza

>= 3.4.0, < 3.8.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/corazawaf/coraza/security/advisories/GHSA-r3rm-qphw-hh76 github.com: https://github.com/corazawaf/coraza/commit/f94c81bec209f658120c418448d0590a549b71df github.com: https://github.com/corazawaf/coraza/releases/tag/v3.8.0