{"id":"CVE-2023-40586","aliases":["EUVD-2023-1768","GHSA-c2pj-v37r-2p6h","GO-2023-1874"],"status":"published","title":"go package github.com/corazawaf/coraza is vulnerable to denial of service","description":"OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. The application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`. This issue was patched in version 3.0.1.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-07","score":0.00723,"percentile":0.54259,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2023-06-26T15:48:33Z","modified":"2026-10-28T02:30:38Z","fixes":[{"ecosystem":"Go","package":"github.com/corazawaf/coraza/v3","fixed_in":["3.0.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/corazawaf/coraza/v3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.1"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/corazawaf/coraza/v2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"last_affected":"2.0.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/corazawaf/coraza/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.0.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/corazawaf/coraza/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"last_affected":"2.0.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/corazawaf/coraza/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/corazawaf/coraza/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.0.1"}]}]}],"products":[{"vendor":"coraza","product":"coraza"},{"vendor":"corazawaf","product":"coraza"}],"references":[{"url":"https://github.com/corazawaf/coraza/security/advisories/GHSA-c2pj-v37r-2p6h","tags":["x_refsource_CONFIRM","x_transferred","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/corazawaf/coraza/commit/a5239ba3ce839e14d9b4f9486e1b4a403dcade8c","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://github.com/corazawaf/coraza-caddy/issues/48","tags":["web"]},{"url":"https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec","tags":["web"]},{"url":"https://github.com/corazawaf/coraza/commit/e1b119b83e12c64f0957e00e8cad45a1b5f012f8","tags":["web"]},{"url":"https://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29","tags":["web"]},{"url":"https://github.com/corazawaf/coraza/releases/tag/v3.0.1","tags":["web"]},{"url":"https://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40586","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c2pj-v37r-2p6h"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/40xxx/CVE-2023-40586.json","tags":["advisory"]},{"url":"https://github.com/corazawaf/coraza","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-40586","title":"go package github.com/corazawaf/coraza is vulnerable to denial of service","description":"OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. The application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`. This issue was patched in version 3.0.1.\n","status":"published","published":"2023-08-25T20:35:27.459Z","modified":"2024-10-02T14:41:35.285Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:21.971258Z"}],"euvd":[{"id":"EUVD-2023-1768","description":"OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. The application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`. This issue was patched in version 3.0.1.\n","status":"published","published":"2023-08-25T20:35:27Z","modified":"2024-10-02T14:41:35Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:27:58.959241Z"}],"ghsa":[{"id":"GHSA-c2pj-v37r-2p6h","title":"Coraza has potential denial of service vulnerability","description":"### Summary\n\nDue to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers.\n\n### Details\n\nhttps://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29\nThe bodyprocessors of multipart uses `log.Fatalf` to handle errors from the `mime.ParseMediaType`, but `log.Fatalf` calls `os.Exit` directly after logging the error.\nhttps://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291\nThis means that the application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`.\n\n### PoC\n\nThe server can be demonstrated by https://github.com/corazawaf/coraza/tree/main/examples/http-server\n\nAfter sending this request\n```\nPOST / HTTP/1.1\nHost: 127.0.0.1:8090\nUser-Agent: curl/8.1.2\nAccept: */*\nContent-Length: 199\nContent-Type: multipart/form-data; boundary=------------------------5fa6351b877326a1; a=1; a=2\nConnection: close\n\n--------------------------5fa6351b877326a1\nContent-Disposition: form-data; name=\"file\"; filename=\"123\"\nContent-Type: application/octet-stream\n\n123\n\n--------------------------5fa6351b877326a1--\n\n```\nThe server will crash immediately. The `a=1; a=2` in `Content-Type` makes `mime: duplicate parameter name` error.\n\n### Impact\n\nI believe the vulnerability was introduced by the following commit: https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec.\n\n### Mitigation\n\nThe error from `mime.ParseMediaType` should return directly.","status":"published","published":"2023-06-26T15:48:33Z","modified":"2023-11-10T05:04:37Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:37:19.438667Z"}],"nvd":[{"id":"CVE-2023-40586","description":"OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. The application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`. This issue was patched in version 3.0.1.\n","status":"published","published":"2023-08-25T21:15:09.197Z","modified":"2026-06-17T06:18:35.653Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:08:25.025396Z"}],"osv":[{"id":"CVE-2023-40586","title":"go package github.com/corazawaf/coraza is vulnerable to denial of service","description":"OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. The application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`. This issue was patched in version 3.0.1.\n","status":"published","published":"2023-08-25T20:35:27.459Z","modified":"2026-10-28T02:30:38.915131142Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:44:33.244128Z"},{"id":"GHSA-c2pj-v37r-2p6h","title":"Coraza has potential denial of service vulnerability","description":"### Summary\n\nDue to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers.\n\n### Details\n\nhttps://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29\nThe bodyprocessors of multipart uses `log.Fatalf` to handle errors from the `mime.ParseMediaType`, but `log.Fatalf` calls `os.Exit` directly after logging the error.\nhttps://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291\nThis means that the application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`.\n\n### PoC\n\nThe server can be demonstrated by https://github.com/corazawaf/coraza/tree/main/examples/http-server\n\nAfter sending this request\n```\nPOST / HTTP/1.1\nHost: 127.0.0.1:8090\nUser-Agent: curl/8.1.2\nAccept: */*\nContent-Length: 199\nContent-Type: multipart/form-data; boundary=------------------------5fa6351b877326a1; a=1; a=2\nConnection: close\n\n--------------------------5fa6351b877326a1\nContent-Disposition: form-data; name=\"file\"; filename=\"123\"\nContent-Type: application/octet-stream\n\n123\n\n--------------------------5fa6351b877326a1--\n\n```\nThe server will crash immediately. The `a=1; a=2` in `Content-Type` makes `mime: duplicate parameter name` error.\n\n### Impact\n\nI believe the vulnerability was introduced by the following commit: https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec.\n\n### Mitigation\n\nThe error from `mime.ParseMediaType` should return directly.","status":"published","published":"2023-06-26T15:48:33Z","modified":"2023-11-08T04:13:22.29558Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:44.571161Z"},{"id":"GO-2023-1874","title":"Denial of service in github.com/corazawaf/coraza/v2 and v3","description":"Due to the misuse of log.Fatalf, Coraza may crash after receiving crafted requests from attackers.","status":"published","published":"2023-07-05T17:30:04Z","modified":"2024-05-20T16:03:47Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}