Vulnerability · Published Jun 2, 2026 · Assigned by EEF

CVE-2026-48596CRLF injection in Tesla.Multipart.add_content_type_param/2 allows HTTP header injection

Low 2.1

In plain English

A low-severity security flaw in tesla from elixir-tesla. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 4.0)2.1Low

Exploit odds (30 days)0.2%top 84.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
elixir-tesla	tesla	0.8.0 – before 1.18.3
elixir-tesla	tesla	6ebfdb9abe9c6f119408045b933d82462decd351 – before 23601edac5d22ba9407b427967b5bdbda201aec2

Weakness: CWE-113 · Vector: 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

References

https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w vendor-advisory, related
EEF CNA record for CVE-2026-48596 related
OSV record EEF-CVE-2026-48596 related
Introducing commit 6ebfdb9 in elixir-tesla/tesla related
Fix commit 23601ed in elixir-tesla/tesla patch