CVE-2026-107685
WebSocket sessions do not verify TLS certificates, exposing API keys and OAuth tokens to on-path attackers
- State
- Published
- Severity
- 9.1 Critical
- Published
- Oct 23, 2026
- Updated
- Oct 23, 2026
- Reserved
- Oct 10, 2026
Description
Improper Certificate Validation vulnerability in the WebSocket streaming client in agentjido req_llm allows an on-path attacker to read and modify OpenAI WebSocket sessions, including the authorization bearer token, via a TLS certificate the client does not trust. ReqLLM.Streaming.WebSocketSession.Client.start/3 in lib/req_llm/streaming/web_socket_session/client.ex starts WebSockex without TLS options, and WebSockex defaults to insecure: true, which connects with verify: :verify_none. The option allowlist also drops any caller-supplied cacerts or ssl_options, so an application cannot turn verification on.
The OpenAI Responses, Realtime, and Codex WebSocket paths reach this client and send the API key or OAuth access token in the authorization header. HTTP streaming through Finch and the HTTP/2 duplex session through Mint verify certificates and are not affected.
This issue affects req_llm: from 1.9.0 before 1.29.0.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.1 Critical | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | EEF |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
req_llmagentjido |
|
req_llmagentjido |
|
References
- WebSocket sessions do not verify TLS certificates, exposing API keys and OAuth tokens to on-path attackersvendor-advisoryrelated
- EEF CNA record for CVE-2026-107685related
- OSV record EEF-CVE-2026-107685related
- Introducing commit a389d71 in agentjido/req_llmrelated
- Fix commit c7264fc in agentjido/req_llmpatch
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