PT-2026-45838 · Elixir Tesla · Tesla

Jonatan Männchen + 2 · Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-48595

NVD

CVSS v4.0

8.2

High

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Improper Handling of Case Sensitivity vulnerability in elixir-tesla tesla allows credential leakage to a third-party origin on cross-origin redirects.

Tesla.Middleware.FollowRedirects strips security-sensitive headers on cross-origin redirects using a case-sensitive string comparison against a lowercase filter list (@filter headers ["authorization", "host"]). HTTP header names are case-insensitive per RFC 7230, but Tesla preserves header keys verbatim as supplied by the caller without normalizing case. A header set as {"Authorization", "Bearer …"} (the RFC 7235 canonical casing used by virtually all HTTP libraries and documentation) does not match the lowercase filter entry and is forwarded to the redirect destination. An attacker who can control or influence a Location: response seen by the client (via their own endpoint, a redirect-open upstream, or a compromised origin) receives the bearer token or other Authorization material on the cross-origin request.

This issue affects tesla: from 1.4.0 before 1.18.3.

Fix

Weakness Enumeration

CWE-178

Related Identifiers

CVE-2026-48595

Affected Products

Tesla

References · 5

• https://github.com/elixir-tesla/tesla/commit/db963dba67651b9abd1fc420a1d9679cf6efe182 · Patch
• https://github.com/elixir-tesla/tesla/security/advisories/GHSA-9m9w-gxf7-rh8m · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48595 · Security Note
• https://osv.dev/vulnerability/EEF-CVE-2026-48595 · Note
• https://cna.erlef.org/cves/CVE-2026-48595.html · Note