{"id":"CVE-2026-112880","summary":"CRLF injection in Proxy-Authorization header built from proxy_auth_fun in hackney","details":"Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in hackney_http_connect in benoitc hackney allows HTTP Request Splitting via the value a proxy_auth_fun callback returns. After a 407 response from an HTTP CONNECT proxy, hackney_http_connect:handle_proxy_auth/11 calls the caller's proxy_auth_fun with the status code and the response headers and writes the returned binary into the Proxy-Authorization line of the CONNECT retry without checking it. A CR, LF or NUL byte in that value adds header lines to the request sent to the proxy.\n\nThe value is attacker-influenced when the callback derives it from untrusted data, for example from the proxy's challenge headers. Other caller-supplied values on the CONNECT path, such as the target host and the request headers, were already checked for control bytes.\n\nThis issue affects hackney: from 2.0.0 before 4.9.0.","aliases":["EEF-CVE-2026-112880"],"modified":"2026-11-11T10:47:23.778955044Z","published":"2026-10-26T13:48:46.589Z","database_specific":{"cwe_ids":["CWE-113"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112880.json","cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-112880.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-112880"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112880.json"},{"type":"ADVISORY","url":"https://github.com/benoitc/hackney/releases/tag/4.9.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112880"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/5df5a74a2817d5b12880d217db33253ff1fae1b5"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/5ee7d7d19eba27e774667d472feb1e93a08af7f9"},{"type":"FIX","url":"https://github.com/benoitc/hackney/pull/989"},{"type":"PACKAGE","url":"https://github.com/benoitc/hackney"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/benoitc/hackney","events":[{"introduced":"5df5a74a2817d5b12880d217db33253ff1fae1b5"},{"fixed":"5ee7d7d19eba27e774667d472feb1e93a08af7f9"},{"introduced":"a7ce34b42892ab305b2ef7dbe873bcabf4ef93ca"},{"fixed":"0f5db333d43600e7b9fb9346143b4e9fdb8924ea"},{"fixed":"5df5a74a2817d5b12880d217db33253ff1fae1b5"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"5df5a74a2817d5b12880d217db33253ff1fae1b5"},{"fixed":"5ee7d7d19eba27e774667d472feb1e93a08af7f9"}]},{"range":[{"introduced":"2.0.0"},{"fixed":"4.9.0"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"original_tag":"4.9.0","range":[{"fixed":"0f5db333d43600e7b9fb9346143b4e9fdb8924ea"}],"source":"REFERENCES_TAG"},{"range":[{"fixed":"5df5a74a2817d5b12880d217db33253ff1fae1b5"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"5ee7d7d19eba27e774667d472feb1e93a08af7f9"}]}]}}],"versions":["4.8.7","4.8.6","4.8.5","4.8.4","4.8.3","4.8.2","4.8.1","4.8.0","4.7.4","4.7.3","4.7.2","4.7.1","4.7.0","4.6.1","4.6.0","4.5.2","4.5.1","4.5.0","4.4.5","4.4.4","4.4.3","4.4.2","4.4.1","4.4.0","4.3.0","4.2.3","4.2.2","4.2.1","4.2.0","4.1.0","4.0.3","4.0.2","4.0.1","4.0.0","3.2.1","3.2.0","3.1.2","3.1.1","3.1.0","3.0.3","3.0.2","3.0.1","2.0.1","2.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112880.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"}]}