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CVE-2026-82641 – Unauthenticated TLS Key Exposure – Keploy 3.1.0 through 3.6.25

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Summary

CVE-2026-82641 is a missing-authentication vulnerability (CWE-306) affecting Keploy, an open-source API testing and traffic-recording tool. The agent’s control-plane HTTP server binds without any authentication mechanism, allowing an unauthenticated network attacker to retrieve live TLS session keys and manipulate active recording sessions. The vulnerability has a CVSS v3.1 base score of 8.6 and a CVSS v4.0 base score of 8.8 (High).

Technical details

  • Root cause: The Keploy agent’s control-plane HTTP server (pkg/agent/routes/server.go) is started with fmt.Sprintf(":%d", port), which binds to all network interfaces (0.0.0.0) instead of loopback only, and none of its endpoints require credentials.
  • Trigger conditions: The agent must be running with its control-plane HTTP server active (native mode, or Docker mode where the port is published as 0.0.0.0:<AgentPort>), leaving it reachable from other local processes or, in Docker deployments, from network peers.
  • Attack vector: Network (AV:N) — no privileges or user interaction required (PR:N/UI:N).
  • Exploitable endpoints:
    • GET /agent/pcap/keylog — streams live NSS keylog lines to any unauthenticated subscriber, generated as the agent MITM-proxies application HTTPS/database connections.
    • POST /agent/stop — allows an attacker to unilaterally terminate an active recording session.
    • POST /agent/storemocks — allows an attacker to inject or overwrite captured mock data.
  • Impact: By subscribing to the keylog stream while capturing traffic via /agent/pcap/traffic, an attacker can fully decrypt recorded TLS sessions (e.g., with Wireshark), exposing sensitive application and database traffic. The exposed control endpoints also allow disruption of active test recordings and tampering with mock data used in downstream testing.

Affected software

  • Keploy (go.keploy.io/server/v3) versions 3.1.0 through 3.6.25 (inclusive).

Severity

  • CVSS v3.1: 8.6 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
  • CVSS v4.0: 8.8 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to a patched Keploy version that includes fix commit a6257d2b3184b85eb30edad345464aa292297b83, which binds the native-mode agent control server to 127.0.0.1 only and restricts Docker port publishing to the host’s loopback interface (127.0.0.1:port:port) rather than all interfaces.
  • If unable to patch immediately:
    • Ensure the Keploy agent’s control-plane port is not published or exposed beyond the local host (avoid 0.0.0.0 bindings in Docker deployments).
    • Restrict network access to hosts running Keploy agents using host-based firewalls or network segmentation, allowing only trusted local processes to reach the agent port.
    • Audit any environments where Keploy agents are running to confirm the control-plane port is not reachable from untrusted networks or shared multi-tenant hosts.

References

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