eSecurity Planet • 5h
AI-Driven Discovery of "ZOOMSDAY" Zero-Click RCE in Zoom Annotation Engine
Zoom has patched a critical zero-click Remote Code Execution (RCE) vulnerability chain, dubbed "ZOOMSDAY," affecting the Zoom annotation engine. The flaw stems from improper validation of packet sizes during the deserialization of in-memory annotation objects, leading to buffer overflows (CVE-2026-53413) and Use-After-Free errors (CVE-2026-53415) within fixed 128-byte buffers. A malicious actor can achieve RCE on any meeting participant's device without user interaction simply by joining the session. The discovery is notable for its AI-accelerated timeline, where an AI agent reduced the vulnerability research cycle from months to under 24 hours.