{"id":"CVE-2026-41508","summary":"OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling","details":"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.","aliases":["GHSA-r3rm-qphw-hh76"],"modified":"2026-10-14T10:30:51.273990857Z","published":"2026-10-12T20:01:09.451Z","database_specific":{"cwe_ids":["CWE-693","CWE-755"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41508.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/corazawaf/coraza/releases/tag/v3.8.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41508.json"},{"type":"ADVISORY","url":"https://github.com/corazawaf/coraza/security/advisories/GHSA-r3rm-qphw-hh76"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41508"},{"type":"FIX","url":"https://github.com/corazawaf/coraza/commit/f94c81bec209f658120c418448d0590a549b71df"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/corazawaf/coraza","events":[{"introduced":"9b1d1e944e147e8f0cb92877864f71b27b9c6a7d"},{"fixed":"f94c81bec209f658120c418448d0590a549b71df"},{"fixed":"19b86824f5e97eba72b289a81d5b3c1260292ff0"}],"database_specific":{"extracted_events":[{"introduced":"3.4.0"},{"fixed":"3.8.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v3.7.0","v3.6.0","v3.5.0","v3.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41508.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}]}