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CVE-2026-48599— Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding

Quick assessment

Affected
elixir-grpc grpc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

elixir-grpc gRPC Elixir是elixir-grpc组织的一款基于Elixir语言构建的gRPC框架。 elixir-grpc gRPC Elixir 0.8.0版本至1.0.0之前版本存在授权问题漏洞，该漏洞源于在'Elixir.GRPC.Server.Transcode':map_request/5函数中对Map.merge/2的参数处理不当，使得路径绑定作为第一个参数优先级最低，允许通过查询字符串或请求体注入冲突值，导致授权绕过。以下版本受到影响：0.8.0版本至1.0.0之前版本

CVSS 7.6 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1078.003 · Local Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
elixir-grpc grpc 0.8.0< 1.0.0 affected
8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048< 33b6a095dbc91c6dee3c7b90893d7d74952e82e4 affected
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I. Basic Information for CVE-2026-48599

Vulnerability Information
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Vulnerability Title
Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding
Source: CVE Program / CVE List V5
Vulnerability Description
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':map_request/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?user_id=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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
elixir-grpc gRPC Elixir 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elixir-grpc gRPC Elixir是elixir-grpc组织的一款基于Elixir语言构建的gRPC框架。 elixir-grpc gRPC Elixir 0.8.0版本至1.0.0之前版本存在授权问题漏洞，该漏洞源于在'Elixir.GRPC.Server.Transcode':map_request/5函数中对Map.merge/2的参数处理不当，使得路径绑定作为第一个参数优先级最低，允许通过查询字符串或请求体注入冲突值，导致授权绕过。以下版本受到影响：0.8.0版本至1.0.0之前版本
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
elixir-grpc grpc 0.8.0 ~ 1.0.0 cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*
elixir-grpc grpc 8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048 ~ 33b6a095dbc91c6dee3c7b90893d7d74952e82e4 cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-48599

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III. Intelligence Information for CVE-2026-48599

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Patches & Fixes for CVE-2026-48599 (2)

Vendor Advisories for CVE-2026-48599 (3)

Same Patch Batch · elixir-grpc · 2026-06-15 · 4 CVEs total

CVE-2026-48853 9.2 CRITICAL Remote code execution and denial of service via unsafe Erlang term deserialization in elix
CVE-2026-48854 8.7 HIGH Unbounded request body accumulation causes memory exhaustion in elixir-grpc/grpc
CVE-2026-53430 grpc gzip decompression bomb in GRPC.Compressor.Gzip.decompress/1

IV. Related Vulnerabilities

Same product: grpc
Same vendor: elixir-grpc
Same weakness: CWE-639

V. Comments for CVE-2026-48599

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