Riskcovery

CVE-2026-41508

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

State
Published
Severity
5.8 Medium
Published
Oct 12, 2026
Updated
Oct 13, 2026
Reserved
Apr 20, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.15.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NGitHub_M

Weaknesses

  • CWE-693 Protection Mechanism Failure
  • CWE-755 Improper Handling of Exceptional Conditions

Affected Products

ProductVersions
corazacorazawaf
  • >= 3.4.0, < 3.8.0Affected

References

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