high severity · published 2026-11-11
A client that authenticated for one hostname can renegotiate the connection under a different servername and carry its existing client-certificate authentication to hosts protected by stricter per-hostname policies. This lets an unauthorized client reach admin-only or otherwise restricted endpoints without meeting those policies.
Fixed in: 26.13.1
CVE: CVE-2026-123872
Source: NVD
You are affected if the installed version is older than 26.13.1. Check the version you have and update to 26.13.1 or later. The fixed version is verified against a vendor or advisory source.
FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 2544 and your operating system.