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securityFriday, August 14, 2026 at 02:29 AM
Zoom Annotation Buffer Flaws Enable Zero-Click Client Hijack Across Meetings

Zoom Annotation Buffer Flaws Enable Zero-Click Client Hijack Across Meetings

Zoom annotation parsing trusted unvalidated counts and message origins, allowing any participant to corrupt memory in all others without interaction. Patches predate disclosure by two months, yet scoring and credit splits reveal persistent gaps between vendor and independent assessments. The pattern points to deeper client trust issues in high-volume collaboration software.

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80.0% accuracy
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No in-the-wild exploitation has surfaced. Organizations should enforce minimum client versions immediately and monitor for follow-on memory-safety findings in the same deserialization paths.

⚡ Prediction

A Security: No confirmed exploitation of the three CVEs in production Zoom traffic within 120 days of public disclosure

Sources (3)

  • [1]
    The Hacker News(https://thehackernews.com/2026/08/zoom-annotation-flaws-could-let-meeting.html)
  • [2]
    A Security Technical Writeup(https://asecurity.io/research/zoom-annotation-2026)
  • [3]
    Zoom Security Bulletin ZSB-26015-17(https://zoom.us/trust/security-bulletins)