---
id: CVE-2026-48596
title: >-
  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_typ…
summary: >-
  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_typ…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-113
  - CWE-93
vendor: elixir-tesla
product: tesla
affected:
  - 'tesla >= 0.8.0, < 1.18.3'
patched:
  - tesla 1.18.3
published: '2026-06-02'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:17:13.370'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48596'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-48596.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/elixir-tesla/tesla/commit/23601edac5d22ba9407b427967b5bdbda201aec2
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/elixir-tesla/tesla/commit/6ebfdb9abe9c6f119408045b933d82462decd351
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-48596'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/elixir-tesla/tesla/security/advisories/GHSA-q7jx-v53g-848w
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48596'
  - url: 'https://github.com/advisories/GHSA-q7jx-v53g-848w'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - erlang
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-03T13:01:48.568462Z'
scores:
  nvd: 3.7
  cna: 2.1
epss: 0.00239
epssPercentile: 0.1491
aliases:
  - GHSA-q7jx-v53g-848w
ecosystem: erlang
ingestedAt: '2026-07-10T00:54:12.246Z'
---

## Overview

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

- `tesla >= 0.8.0, < 1.18.3`

## Remediation

Upgrade past the affected range:

- `tesla 1.18.3`

## Package advisory (CVE-2026-48596)

Affected packages:

- `tesla >= 0.8.0, < 1.18.3`

Patched in:

- `tesla 1.18.3`

Source: https://github.com/advisories/GHSA-q7jx-v53g-848w