{"id":"EEF-CVE-2026-48596","summary":"CRLF injection in Tesla.Multipart.add_content_type_param/2 allows HTTP header injection","details":"## Summary\n\nImproper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in elixir-tesla tesla allows HTTP header injection via `Tesla.Multipart.add_content_type_param/2`.\n\n`Tesla.Multipart.add_content_type_param/2` appends caller-supplied strings to the multipart `content_type_params` list without validating for CR (`\\r`) or LF (`\\n`) characters. `Tesla.Multipart.headers/1` then joins these params verbatim with `\"; \"` to construct the outgoing `Content-Type` header value. A param containing `\\r\\n` splits the header line, allowing arbitrary headers to be injected into the outbound HTTP request. Any application that forwards untrusted input (such as a user-supplied charset or parameter string) into `add_content_type_param/2` is affected.\n\nThis issue affects tesla: from 0.8.0 before 1.18.3.\n\n## Workarounds\n\nValidate content-type parameter strings before passing them to `Tesla.Multipart.add_content_type_param/2`, rejecting any value that contains `\\r` or `\\n`.\n\n## Configurations\n\nThe application must pass untrusted input into `Tesla.Multipart.add_content_type_param/2`.","aliases":["CVE-2026-48596","GHSA-q7jx-v53g-848w"],"modified":"2026-09-24T21:01:09.494325910Z","published":"2026-06-02T19:09:31.615Z","database_specific":{"cpe_ids":["cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-113"],"capec_ids":["CAPEC-105"]},"references":[{"type":"ADVISORY","url":"https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-48596.html"},{"type":"WEB","url":"https://github.com/elixir-tesla/tesla/commit/6ebfdb9abe9c6f119408045b933d82462decd351"},{"type":"FIX","url":"https://github.com/elixir-tesla/tesla/commit/23601edac5d22ba9407b427967b5bdbda201aec2"},{"type":"PACKAGE","url":"https://hex.pm/packages/tesla"}],"affected":[{"package":{"name":"tesla","ecosystem":"Hex","purl":"pkg:hex/tesla"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.8.0"},{"fixed":"1.18.3"}]}],"versions":["0.10.0","0.8.0","0.9.0","1.0.0","1.0.0-beta.1","1.1.0","1.10.0","1.10.1","1.10.2","1.10.3","1.11.0","1.11.1","1.11.2","1.12.0","1.12.1","1.12.2","1.12.3","1.13.0","1.13.1","1.13.2","1.14.0","1.14.1","1.14.2","1.14.3","1.15.0","1.15.1","1.15.2","1.15.3","1.16.0","1.17.0","1.18.0","1.18.1","1.18.2","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.3.3","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.5.0","1.5.1","1.6.0","1.6.1","1.7.0","1.8.0","1.8.1","1.9.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-48596.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/elixir-tesla/tesla","events":[{"introduced":"6ebfdb9abe9c6f119408045b933d82462decd351"},{"fixed":"23601edac5d22ba9407b427967b5bdbda201aec2"}]}],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-48596.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N"}],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Yordis Prieto","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}]}