Describe v0.10.3

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -20,6 +20,49 @@ is only released once its **exit criterion** is met, not when its code lands.
 Until v1.0.0 the minor version is the breaking one: configuration formats and Go
 APIs change between minors without a deprecation period.
 
+## v0.10.3 — 2026-09-30
+
+Security fixes from a review of v0.10.2. Three of them were confirmed on the
+live cluster before being fixed.
+
+### Engines demand a key only the router holds
+
+Engines listened on every address of their node with no key. A request from a
+neighbouring node reached the model directly, past the gateway's
+authentication, quotas and accounting. Each replica's engine is now started
+with a key derived from the replica id and a secret in the store. The router,
+its metrics scrape, the agent's readiness check and `ctl bench` send it.
+llama.cpp and vLLM receive it through their environment, not their command
+line. Engines started before this keep running without a key until their
+replica is next started.
+
+### The mirror's management API answers only who it was told to
+
+Without `--api-allow`, the management API answered anyone who could reach it,
+including every node. It now answers this machine only; the control plane is
+let in with `--api-allow` or mutual TLS. **Upgrading a mirror set up by hand:
+add `--api-allow <control plane address>` to its unit.** Downloads started
+through the API go to http and https only, and never to loopback, private or
+link-local addresses (`--allow-private-sources` to permit that). Model,
+version and file names can no longer be `..` or start with a dot.
+
+### The admin listener refuses what a browser page could send
+
+The admin API has no login and trusts whoever reaches it. A page open in an
+operator's browser, reaching it over an ssh tunnel, could post a model
+definition. The listener now requires Host to be an address or localhost,
+refuses cross-site requests, and takes changes only as `application/json`.
+A profile's `env` may no longer set variables that make an engine run other
+code (`LD_*`, `PATH`, `PYTHON*` start-up variables, `BASH_ENV` and similar).
+They are refused where a model is defined and dropped again before an engine
+starts.
+
+### Fixes
+
+- The agent installs only engine versions that look like one, whatever the
+  control plane sent; a version of `../x` could have installed outside
+  `/opt/llmgw/engines`.
+
 ## v0.10.2 — 2026-09-29
 
 - After `server init`'s screen closes, only the administrator's password and