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.
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Affected Vendors & Products
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History
Tue, 13 Oct 2026 22:30:00 +0000
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ssvc
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Tue, 13 Oct 2026 07:30:00 +0000
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Coraza
Coraza coraza |
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Coraza
Coraza coraza |
Mon, 12 Oct 2026 20:30:00 +0000
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| 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. | |
| Title | OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling | |
| Weaknesses | CWE-693 CWE-755 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-12T20:01:09.451Z
Updated: 2026-10-13T20:24:17.217Z
Reserved: 2026-04-20T18:18:50.681Z
Link: CVE-2026-41508
Updated: 2026-10-13T20:19:07.906Z
Status : Deferred
Published: 2026-10-12T21:17:17.240
Modified: 2026-10-16T20:04:29.760
Link: CVE-2026-41508
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