CVE-2026-48596
Improper 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. 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. This issue affects tesla: from 0.8.0 before 1.18.3.
- Score
- CVSS 3.1 3.7 Low
- Status
- Modified - 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
- Published
- 2026-06-02
- Last modified
- 2026-09-24
- Weaknesses
- CWE-113
Affected products
References
- https://cna.erlef.org/cves/CVE-2026-48596.html
- https://github.com/elixir-tesla/tesla/commit/23601edac5d22ba9407b427967b5bdbda201aec2
- https://github.com/elixir-tesla/tesla/commit/6ebfdb9abe9c6f119408045b933d82462decd351
- https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w
- https://osv.dev/vulnerability/EEF-CVE-2026-48596
