{"id":"CVE-2025-59822","state":"PUBLISHED","title":"Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section","description":"Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section. This vulnerability could enable attackers to bypass front-end servers security controls, launch targeted attacks against active users, and poison web caches. A pre-requisite for exploitation involves the web application being deployed behind a reverse-proxy that forwards trailer headers. This issue has been patched in versions 1.0.0-M45 and 0.23.31.","publishedAt":"2025-09-23T18:54:42.867Z","updatedAt":"2025-09-23T19:17:26.320Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["http4s http4s"],"affected":[{"vendor":"http4s","product":"http4s","versions":[{"version":"< 0.23.31","status":"affected"},{"version":">= 1.0.0-M1, < 1.0.0-M45","status":"affected"}]}],"references":["https://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrr","https://github.com/http4s/http4s/commit/dd518f7c967e5165813b8d4a48a82b8fab852d41"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:09:39.787Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/59xxx/CVE-2025-59822.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-59822","state":"PUBLISHED","datePublished":"2025-09-23T18:54:42.867Z","dateUpdated":"2025-09-23T19:17:26.320Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-09-22T14:34:03.470Z"},"containers":{"cna":{"title":"Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section","descriptions":[{"lang":"en","value":"Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section. This vulnerability could enable attackers to bypass front-end servers security controls, launch targeted attacks against active users, and poison web caches. A pre-requisite for exploitation involves the web application being deployed behind a reverse-proxy that forwards trailer headers. This issue has been patched in versions 1.0.0-M45 and 0.23.31."}],"affected":[{"vendor":"http4s","product":"http4s","versions":[{"version":"< 0.23.31","status":"affected"},{"version":">= 1.0.0-M1, < 1.0.0-M45","status":"affected"}]}],"references":[{"url":"https://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrr","name":"https://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/http4s/http4s/commit/dd518f7c967e5165813b8d4a48a82b8fab852d41","name":"https://github.com/http4s/http4s/commit/dd518f7c967e5165813b8d4a48a82b8fab852d41","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-09-23T18:54:42.867Z"},"source":{"advisory":"GHSA-wcwh-7gfw-5wrr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-09-23T19:15:00.938453Z","id":"CVE-2025-59822","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-09-23T19:17:26.320Z"}}]}}}