CVE-2026-48596

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

State: Published
Severity: 2.1 Low
Published: Jun 2, 2026
Updated: Sep 24, 2026
Reserved: May 22, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	2.1 Low	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	EEF

Weaknesses

CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Affected Products

Product	Versions
teslaelixir-tesla	0.8.0 to before 1.18.3Affected
teslaelixir-tesla	6ebfdb9abe9c6f119408045b933d82462decd351 to before 23601edac5d22ba9407b427967b5bdbda201aec2Affected

References

https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848wvendor-advisoryrelated
EEF CNA record for CVE-2026-48596related
OSV record EEF-CVE-2026-48596related
Introducing commit 6ebfdb9 in elixir-tesla/teslarelated
Fix commit 23601ed in elixir-tesla/teslapatch

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