CVE-2026-107685: WebSocket sessions do not verify TLS certificates, exposing API keys and OAuth tokens to on-path attackers

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 10 Nov 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

0.3%

EPSS score, percentile 20 of all scored records. A probability estimated by FIRST, not a report of exploitation.

CISA's SSVC assessment in the CVE record lists exploitation as poc.

How severe?

9.1 Critical

CVSS v4.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (2)

Which versions are affected?

Affected

• from 1.9.0 to before 1.29.0

Versions by product

Source: CISA KEV 2026.11.10, as of 10 Nov 2026; FIRST EPSS, as of 12 Nov 2026; CVE List, as of 12 Nov 2026. About the data.

Description

WebSocket sessions do not verify TLS certificates, exposing API keys and OAuth tokens to on-path attackers

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.

Source: CVE List, as of 12 Nov 2026. About the data.

What to do

Advisories and patches

• Fix commit c7264fc in agentjido/req_llm (Patch)
• WebSocket sessions do not verify TLS certificates, exposing API keys and OAuth tokens to on-path attackers (Vendor advisory)

Workaround (from the CVE record)

Leave the openai_stream_transport provider option at its default :sse for the OpenAI and OpenAI Codex providers, and do not call ReqLLM.Providers.OpenAI.WebSocket.start_responses_session/2 directly. Responses streaming then runs over HTTP through Finch, which verifies certificates. ReqLLM.OpenAI.Realtime.connect/2 has no HTTP alternative, so do not use it on an affected version.

This summary is based on the CVE record as of 12 Nov 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 12 Nov 2026. About the data.

Timeline