{"id":"CVE-2023-22465","summary":"Http4s has fatal error parsing User-Agent and Server headers","details":"Http4s is a Scala interface for HTTP services. Starting with version 0.1.0 and prior to versions 0.21.34, 0.22.15, 0.23.17, and 1.0.0-M38, the `User-Agent` and `Server` header parsers are susceptible to a fatal error on certain inputs.  In http4s, modeled headers are lazily parsed, so this only applies to services that explicitly request these typed headers. Fixes are released in 0.21.34, 0.22.15, 0.23.17, and 1.0.0-M38. As a workaround, use the weakly typed header interface.","aliases":["GHSA-54w6-vxfh-fw7f"],"modified":"2026-08-12T03:51:22.355302296Z","published":"2023-01-04T15:30:04.129Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/22xxx/CVE-2023-22465.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/22xxx/CVE-2023-22465.json"},{"type":"ADVISORY","url":"https://github.com/http4s/http4s/security/advisories/GHSA-54w6-vxfh-fw7f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-22465"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/http4s/http4s","events":[{"introduced":"1cb3dd7d66767ad02f6431d290ca14c07ec99c30"},{"fixed":"f09ae5a20f23798f10537dc3684b614d0c454fea"},{"introduced":"3e98ea4a63e741c7f9d5e917d48d2ee8fab54476"},{"fixed":"3eade0b5c8d6a8271444604760912c861807d0b9"},{"introduced":"06db471f053023ce3ffd7c568ce46d33551d1d69"},{"fixed":"cc61c693e4f78d84f77f0ac8e7f6431fe72f4cc4"},{"introduced":"756ce63aee681c5b632bbeafe0b8fde2f3d237f4"},{"last_affected":"6676c1e24a4e32e0c6c1a36911f4e6606c10e12b"}],"database_specific":{"extracted_events":[{"introduced":"0.1.0"},{"fixed":"0.21.34"},{"introduced":"0.22.0"},{"fixed":"0.22.15"},{"introduced":"0.23.0"},{"fixed":"0.23.17"},{"introduced":"1.0.0-milestone1"},{"last_affected":"1.0.0-milestone1"},{"introduced":"1.0.0-milestone10"},{"last_affected":"1.0.0-milestone10"},{"introduced":"1.0.0-milestone11"},{"last_affected":"1.0.0-milestone11"},{"introduced":"1.0.0-milestone12"},{"last_affected":"1.0.0-milestone12"},{"introduced":"1.0.0-milestone13"},{"last_affected":"1.0.0-milestone13"},{"introduced":"1.0.0-milestone14"},{"last_affected":"1.0.0-milestone14"},{"introduced":"1.0.0-milestone15"},{"last_affected":"1.0.0-milestone15"},{"introduced":"1.0.0-milestone16"},{"last_affected":"1.0.0-milestone16"},{"introduced":"1.0.0-milestone17"},{"last_affected":"1.0.0-milestone17"},{"introduced":"1.0.0-milestone18"},{"last_affected":"1.0.0-milestone18"},{"introduced":"1.0.0-milestone19"},{"last_affected":"1.0.0-milestone19"},{"introduced":"1.0.0-milestone2"},{"last_affected":"1.0.0-milestone2"},{"introduced":"1.0.0-milestone20"},{"last_affected":"1.0.0-milestone20"},{"introduced":"1.0.0-milestone21"},{"last_affected":"1.0.0-milestone21"},{"introduced":"1.0.0-milestone22"},{"last_affected":"1.0.0-milestone22"},{"introduced":"1.0.0-milestone23"},{"last_affected":"1.0.0-milestone23"},{"introduced":"1.0.0-milestone24"},{"last_affected":"1.0.0-milestone24"},{"introduced":"1.0.0-milestone25"},{"last_affected":"1.0.0-milestone25"},{"introduced":"1.0.0-milestone26"},{"last_affected":"1.0.0-milestone26"},{"introduced":"1.0.0-milestone27"},{"last_affected":"1.0.0-milestone27"},{"introduced":"1.0.0-milestone28"},{"last_affected":"1.0.0-milestone28"},{"introduced":"1.0.0-milestone29"},{"last_affected":"1.0.0-milestone29"},{"introduced":"1.0.0-milestone3"},{"last_affected":"1.0.0-milestone3"},{"introduced":"1.0.0-milestone30"},{"last_affected":"1.0.0-milestone30"},{"introduced":"1.0.0-milestone31"},{"last_affected":"1.0.0-milestone31"},{"introduced":"1.0.0-milestone32"},{"last_affected":"1.0.0-milestone32"},{"introduced":"1.0.0-milestone33"},{"last_affected":"1.0.0-milestone33"},{"introduced":"1.0.0-milestone34"},{"last_affected":"1.0.0-milestone34"},{"introduced":"1.0.0-milestone35"},{"last_affected":"1.0.0-milestone35"},{"introduced":"1.0.0-milestone36"},{"last_affected":"1.0.0-milestone36"},{"introduced":"1.0.0-milestone37"},{"last_affected":"1.0.0-milestone37"},{"introduced":"1.0.0-milestone4"},{"last_affected":"1.0.0-milestone4"},{"introduced":"1.0.0-milestone5"},{"last_affected":"1.0.0-milestone5"},{"introduced":"1.0.0-milestone6"},{"last_affected":"1.0.0-milestone6"},{"introduced":"1.0.0-milestone7"},{"last_affected":"1.0.0-milestone7"},{"introduced":"1.0.0-milestone8"},{"last_affected":"1.0.0-milestone8"},{"introduced":"1.0.0-milestone9"},{"last_affected":"1.0.0-milestone9"}],"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone1:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone10:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone11:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone12:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone13:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone14:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone15:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone16:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone17:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone18:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone19:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone2:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone20:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone21:*:*:*:*:*:*","cpe:2.3:a:typelevel:http4s:1.0.0:milestone22:*:*:*:*:*:*","cpe:2.3:a:typelev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