CVE-2026-48599

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Source

https://cve.org/CVERecord?id=CVE-2026-48599

Import Source

https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-48599.json

JSON Data

https://api.test.osv.dev/v1/vulns/CVE-2026-48599

Aliases

EEF-CVE-2026-48599
GHSA-mwr4-5g34-j5cq

Published

2026-06-15T21:55:28.702Z

Modified

2026-06-18T03:56:23.550942540Z

Severity

7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding

Details

Authorization Bypass Through User-Controlled Key vulnerability in elixir-grpc grpc allows authenticated attackers to access or modify resources belonging to other users by smuggling a conflicting value for any path-bound field via the query string or request body.

In 'Elixir.GRPC.Server.Transcode':maprequest/5 (lib/grpc/server/transcode.ex), all three clauses use Map.merge/2 with path bindings as the first argument, giving them the lowest merge precedence. A request such as GET /users/me/profile?userid=victim (or a POST with {"user_id": "victim"} when body: "*") yields a decoded protobuf struct where the path-bound field carries the attacker-supplied value rather than the router-extracted value. Any handler that uses the path-bound field for authorization, multi-tenancy scoping, or ownership checks is silently bypassed.

This issue affects grpc from 0.8.0 before 1.0.0.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48599.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048"
                },
                {
                    "fixed": "33b6a095dbc91c6dee3c7b90893d7d74952e82e4"
                }
            ]
        }
    ],
    "cwe_ids": [
        "CWE-639"
    ],
    "cna_assigner": "EEF"
}

References

Affected packages

Git / github.com/elixir-grpc/grpc

Affected ranges

Type

GIT

Repo

https://github.com/elixir-grpc/grpc

Events

Introduced

eda2edc2f43010517b9f7992ccb181792175a17f

Fixed

8105f803030f7f5ae1d722251ee6ab2e36878830

Fixed

33b6a095dbc91c6dee3c7b90893d7d74952e82e4

Database specific

{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.8.0"
        },
        {
            "fixed": "1.0.0"
        }
    ]
}

Affected versions

v0.*

v0.11.2

v0.8.0

v0.8.1

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-48599.json"