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Authorization header leaks to third-party origin on cross-origin redirect in Tesla.Middleware.FollowRedirects

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-48595

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-48595

tesla

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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tesla

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"
    ],
    "repo": "https://github.com/elixir-tesla/tesla",
    "vendor": "elixir-tesla",
    "modules": [
      "'Elixir.Tesla.Middleware.FollowRedirects'"
    ],
    "product": "tesla",
    "versions": [
      {
        "status": "affected",
        "version": "1.4.0",
        "lessThan": "1.18.3",
        "versionType": "semver"
      }
    ],
    "packageURL": "pkg:hex/tesla",
    "packageName": "tesla",
    "programFiles": [
      "lib/tesla/middleware/follow_redirects.ex"
    ],
    "collectionURL": "https://repo.hex.pm",
    "defaultStatus": "unaffected",
    "programRoutines": [
      {
        "name": "'Elixir.Tesla.Middleware.FollowRedirects':call/3"
      }
    ]
  },
  {
    "cpes": [
      "cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"
    ],
    "repo": "https://github.com/elixir-tesla/tesla",
    "vendor": "elixir-tesla",
    "modules": [
      "'Elixir.Tesla.Middleware.FollowRedirects'"
    ],
    "product": "tesla",
    "versions": [
      {
        "status": "affected",
        "version": "2d937d5813d7cda5cd726f41824985fb655c920f",
        "lessThan": "db963dba67651b9abd1fc420a1d9679cf6efe182",
        "versionType": "git"
      }
    ],
    "packageURL": "pkg:github/elixir-tesla/tesla",
    "packageName": "elixir-tesla/tesla",
    "programFiles": [
      "lib/tesla/middleware/follow_redirects.ex"
    ],
    "collectionURL": "https://github.com",
    "defaultStatus": "unaffected",
    "programRoutines": [
      {
        "name": "'Elixir.Tesla.Middleware.FollowRedirects':call/3"
      }
    ]
  }
]
Related CVEs
CVE-2026-48595

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#1902 · Revision 1
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Publisher date
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