CVE-2026-48596: Elixir-Tesla Tesla

Low severity, CVSS 3.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Elixir-Tesla Tesla: from 0.8.0, before 1.18.3 (fixed in 1.18.3)

Published 2026-06-02. Last modified 2026-09-24.