{"id":"CVE-2026-112880","published":"2026-10-26T14:16:28.440","lastModified":"2026-10-26T16:59:16.113","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-113"],"vendors":[],"products":[],"references":[{"url":"https://cna.erlef.org/cves/CVE-2026-112880.html","tags":[]},{"url":"https://github.com/benoitc/hackney/commit/5df5a74a2817d5b12880d217db33253ff1fae1b5","tags":[]},{"url":"https://github.com/benoitc/hackney/commit/5ee7d7d19eba27e774667d472feb1e93a08af7f9","tags":[]},{"url":"https://github.com/benoitc/hackney/pull/989","tags":[]},{"url":"https://github.com/benoitc/hackney/releases/tag/4.9.0","tags":[]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-112880","tags":[]}],"exploitRefs":[{"url":"https://github.com/benoitc/hackney/commit/5df5a74a2817d5b12880d217db33253ff1fae1b5","tags":[]},{"url":"https://github.com/benoitc/hackney/commit/5ee7d7d19eba27e774667d472feb1e93a08af7f9","tags":[]},{"url":"https://github.com/benoitc/hackney/pull/989","tags":[]},{"url":"https://github.com/benoitc/hackney/releases/tag/4.9.0","tags":[]}],"hasPoc":true,"ai":null}