CVE-2026-63406

Overview

AnyCable prior to version 1.6.15 contains an information exposure vulnerability within its telemetry subsystem. The application includes secret configuration values and command-line arguments in the generation of a cluster fingerprint. This fingerprint is subsequently transmitted via telemetry using a hardcoded authentication token.

Description

AnyCable is a realtime server for reliable two-way communication that supports any backend. Prior to 1.6.15, the telemetry subsystem in telemetry/config.go enables tracking with a hardcoded public authToken, while clusterFingerprint in telemetry/telemetry.go reads the full configuration file and raw os.Args returned by anycableCLIArgs, including values supplied through --secret, --jwt_secret, and --http_rpc_secret. These inputs are passed to generateDigest, where sha256.New produces the hexadecimal fingerprint that is sent as telemetry. The available source therefore does not show raw credentials leaving the process or establish the advisory's claimed confidentiality loss, although the stable fingerprint is derived from secret-bearing configuration and the default telemetry client uses publicly known authentication material. This issue is fixed in version 1.6.15.

Impact

The vulnerability affects the confidentiality of sensitive configuration data, potentially exposing hashes derived from secrets such as JWT and HTTP RPC secrets to telemetry endpoints. System administrators and organizations running affected AnyCable servers are impacted. While raw credentials may not be directly exfiltrated, the derived hashes lower the effort required for offline brute-force or identification attacks against sensitive parameters.

Remediation

['Upgrade AnyCable to version 1.6.15 or later immediately.', 'Disable the telemetry subsystem if it is not required for your deployment.', 'Audit configuration files and command-line arguments to ensure secrets are properly secured and rotated if unauthorized telemetry ingestion is suspected.']

Risk context

The vulnerability is rated as medium severity with a CVSS v3 score of 5.9, reflecting a moderate risk due to potential exposure of sensitive configuration derivatives. Defenders should prioritize patching during standard maintenance cycles or sooner if external telemetry collection is active and untrusted.

Affected products

• AnyCable < 1.6.15