agentjido req_llm up to 1.28.9 WebSocket Streaming Client client.ex ReqLLM.Streaming.WebSocketSession.Client.start certificate validation

Summaryinfo

A vulnerability, which was classified as problematic, has been found in agentjido req_llm up to 1.28.9. This impacts the function ReqLLM.Streaming.WebSocketSession.Client.start of the file lib/req_llm/streaming/web_socket_session/client.ex of the component WebSocket Streaming Client. Performing a manipulation results in certificate validation. This vulnerability was named CVE-2026-107685. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in agentjido req_llm up to 1.28.9. It has been classified as problematic. This affects the function ReqLLM.Streaming.WebSocketSession.Client.start of the file lib/req_llm/streaming/web_socket_session/client.ex of the component WebSocket Streaming Client. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-107685 since 10/10/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

Upgrading to version 1.29.0 eliminates this vulnerability.

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Productinfo

Vendor

• agentjido

Name

• req_llm

Version

• 1.28.0
• 1.28.1
• 1.28.2
• 1.28.3
• 1.28.4
• 1.28.5
• 1.28.6
• 1.28.7
• 1.28.8
• 1.28.9

Website

• Product: https://github.com/agentjido/req_llm/

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