Vulnerability advisory

CVE-2026-48596

CRLF injection in Tesla.Multipart.add_content_type_param/2 allows HTTP header injection

Published Jun 2, 2026Updated Oct 28, 2026OSV record ↗

Also known as EEF-CVE-2026-48596GHSA-q7jx-v53g-848w

Severity

CVSS 4.0CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Affected versions

Repository

Affected commits	Fixed by commit
GIT github.com/elixir-tesla/tesla ↗
fed422b5ec981cc6237b6a2c1be52e4564461bad to before 2eb7a78948f9c3b18509bf28bdc729e07f46e0dc	`2eb7a78948f9c3b18509bf28bdc729e07f46e0dc`
Not specified	`23601edac5d22ba9407b427967b5bdbda201aec2`
Not specified	`6ebfdb9abe9c6f119408045b933d82462decd351`
Also listed as affected (51) `v1.18.2` `v1.18.1` `v1.18.0` `v1.17.0` `v1.16.0` `v1.15.3` `v1.15.2` `v1.15.1` `v1.15.0` `v1.14.3` `v1.14.2` `v1.14.1` `v1.14.0` `v1.13.2` `v1.13.1` `v1.13.0` `v1.12.3` `v1.12.2` `v1.12.1` `v1.12.0` `v1.11.2` `v1.11.1` `v1.11.0` `v1.10.3` `v1.10.2` `v1.10.1` `v1.10.0` `v1.9.0` `v1.8.0` `v1.7.0` `v1.6.1` `v1.6.0` `v1.5.1` `v1.5.0` `v1.4.4` `v1.4.3` `v1.4.2` `v1.4.1` `v1.4.0` `v1.3.3` `v1.3.2` `v.1.3.2` `v1.3.1` `v1.3.0` `v1.2.1` `v1.2.0` `v1.1.0` `v1.0.0-beta.1` `v0.10.0` `v0.9.0` `v0.8.0`

Description

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.

CVE-2026-48596

Affected versions

Repository

Description

References