PT-2026-45841 · Elixir Tesla · Tesla

Jonatan Männchen + 2 · Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-48598

Mitre

CVSS v4.0

2.1

Low

Base vector

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

Improper Encoding or Escaping of Output vulnerability in elixir-tesla tesla allows multipart part header injection via unescaped Content-Disposition parameter values.

Tesla.Multipart.part headers for disposition/1 interpolates each disposition parameter as #{k}="#{v}" with no validation of CR (r), LF ( ), or double-quote characters. The values come verbatim from the caller via Tesla.Multipart.add field/4 (the name parameter), Tesla.Multipart.add file/3, and Tesla.Multipart.add file content/4 (both the filename parameter and other disposition opts). A " in the value closes the quoted parameter early; a r ends the Content-Disposition header line and starts a new part header (such as a forged Content-Type), or, after a second r , ends the entire part header block and prepends bytes to the part body. The default-filename path in add file/3 derives the filename via Path.basename/1, which does not strip CR or LF, so any application forwarding a partially-attacker-controlled file path inherits the same issue.

This issue affects tesla: from 0.8.0 before 1.18.3.

Fix

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-116

Related Identifiers

CVE-2026-48598

Affected Products

Tesla

References · 5

• https://github.com/elixir-tesla/tesla/security/advisories/GHSA-28jh-g32x-v9v4 · Vendor Advisory
• https://github.com/elixir-tesla/tesla/commit/bb1a2c3da2775924d96e3db8e315dcc4d5d2246e · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-48598 · Security Note
• https://cna.erlef.org/cves/CVE-2026-48598.html · Note
• https://osv.dev/vulnerability/EEF-CVE-2026-48598 · Note