CVE-2026-77177

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Open GenAI Stack (aka ogx-ai) 2026-06-11, as used in the Meta AI backend for WhatsApp and other products, allows code execution because prompt injection (with Jinja2 template syntax) can be used to achieve server-side expression evaluation without sanitization.

Published 2026-09-29. Last modified 2026-09-30.