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CVE-2026-77791 is an uncontrolled resource consumption vulnerability in Apache Tomcat's WebSocket close-message sending path. Processing a WebSocket connection closure can enter a busy-wait condition, consuming server resources and enabling denial of service. Affected versions are Tomcat 11.0.0-M5 through 11.0.25, 10.1.8 through 10.1.59, and 9.0.74 through 9.0.121. End-of-life Tomcat 8.5.88 through 8.5.100 is also known to be affected; other unsupported releases may be affected.
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No public exploit code observed for this vulnerability.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A WebSocket denial-of-service vulnerability caused by a busy wait during close-message transmission.
An Apache Tomcat WebSocket denial-of-service flaw caused by a busy wait during close-message transmission.
An uncontrolled resource-consumption flaw in Apache Tomcat's handling of WebSocket close messages that can enable a denial-of-service attack.
A vulnerability referenced by the Apache Tomcat 10.1.60 security advisory; the content provides no technical details.
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.