What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-02 · updated 2026-09-24
• Weakness: CWE-113

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

• elixir-tesla tesla: from 0.8.0 before 1.18.3 — fixed in 1.18.3

How to fix

Upgrade to a fixed version: elixir-tesla tesla 1.18.3. Check the vendor advisory for mitigations.

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
• https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w

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