CVE-2026-110616

NullHub through 2026.5.29 contains a missing authentication vulnerability that allows unauthenticated attackers to access the /api/* management API because the auth_token field defaults to null and is never assigned. Attackers sending requests without Authorization or Origin headers to non-loopback listeners can control agent instances, rewrite configurations including provider credentials, and manage cron jobs and MCP servers.

• https://github.com/nullclaw/nullhub
• https://github.com/nullclaw/nullhub/blob/v2026.5.29/Dockerfile#L69-L71
• https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/api/settings.zig#L29-L54
• https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/server.zig#L546-L556
• https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izg
• https://www.vulncheck.com/advisories/nullhub-through-2026.5.29-missing-authentication-for-api-management-api
• https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izg