Heads up: if you use GitHub Copilot, go patch it today
Quick PSA for anyone here using GitHub Copilot in Visual Studio: there's a real CVE out as of yesterday and you should go patch. CVE-2026-41109. CVSS 8.8. The short version: an attacker can get Copilot to silently inject code into your editor, with the Accept/Reject prompt suppressed and any policy filters skipped. You don't see the suggestion. It just lands. Microsoft already shipped the patch. Update Visual Studio and the Copilot extension and you're good. If you manage other devs' machines, nudge them too. Now the part that's actually interesting for this group. This is the textbook indirect prompt injection pattern we've been talking about. Untrusted content goes into the model's context. Model emits something downstream. Downstream component (in this case, the editor's auto-apply path) trusts the output and acts on it. What's new is that this one has a CVE number, a CVSS, and a Patch Tuesday entry. So now it's not a research curiosity. It's a thing your AppSec team is on the hook for. A few things worth thinking about beyond just patching: Where else in your stack does model output cross into something that acts? File writes, terminal exec, commit hooks, CI runners, MCP tools. Anywhere model output gets trusted by the next link in the chain is the same bug class waiting to happen. Do you actually have an inventory of the AI dev tools running on your engineers' machines? Not just "Copilot is approved." The extensions, the MCP servers, the local agents, the model endpoints they reach. If you've been doing the labs in the workbench, you've already built the muscle for thinking about this. This CVE is just the same threat model you've been practicing on, with a real product name attached. Patch first, then come back and tell me: where in your environment is model output crossing a trust boundary you haven't drawn yet? Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41109