CVE-2026-40525: Volcengine Openviking

Critical severity, CVSS 9.1. EPSS: 0.8% chance of exploitation in the next 30 days.

OpenViking prior to version 0.3.9 contains an authentication bypass vulnerability in the VikingBot OpenAPI HTTP route surface where the authentication check fails open when the api_key configuration value is unset or empty. Remote attackers with network access to the exposed service can invoke privileged bot-control functionality without providing a valid X-API-Key header, including submitting attacker-controlled prompts, creating or using bot sessions, and accessing downstream tools, integrations, secrets, or data accessible to the bot.

Affected products

• Volcengine Openviking: before 0.3.9 (fixed in 0.3.9)

Published 2026-04-17. Last modified 2026-10-08.