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CVE-2026-53413, dubbed Zoomsday, is a stack-based buffer overflow in the Zoom Clients annotation-processing functionality. The flaw is reachable through Zoom's proprietary annotation protocol during a meeting. In CAnnoFormatBlock::Deserialize, an attacker-controlled 32-bit character count governs copying annotation formatting data into fixed 128-byte buffers without validating that the supplied length fits. An oversized annotation object can overwrite adjacent stack memory, including control-flow data. Insufficient validation of annotation-message origin and dispatch can permit malicious annotation objects to be deserialized by unintended meeting participants.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
39 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Memory corruption vulnerability in Zoom's annotation protocol that can enable zero-click remote code execution against meeting participants/viewers.
One of two Zoom CVEs counted for a campaign described as chaining into a zero-click meeting-client compromise; no further technical detail is provided.
A vulnerability affecting Zoom products, referenced in a Nessus plugin for Zoom Workplace/Meetings, with available exploits and a published patch.
A vulnerability in Zoom Workplace / Zoom Meetings tracked as CVE-2026-53413. The content indicates it is remotely exploitable with high impact to confidentiality, integrity, and availability, and that exploit code is available.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.