CVE-2026-78662
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
Previously, a channel registered in the mux's chanList was not usable until established. A malicious peer could flood the channel's incomingRequests, deadlocking the entire connection. Now, an atomic established state is added, set when a channel becomes usable. Until then, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.
Risk Assessment
The vulnerability allowed an attacker to cause connection deadlock, potentially leading to denial of service. The fix eliminates this risk.
Recommendation
Update the component to a version containing the fix that adds the atomic established state. Ensure all instances are updated.
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Original NVD description (English source)
Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

