Vulnerability Details CVE-2026-31814
Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. From 0.13.0 to before 0.13.9, a specially crafted WindowUpdate can cause arithmetic overflow in send-window accounting, which triggers a panic in the connection state machine. This is remotely reachable over a normal network connection and does not require authentication. This vulnerability is fixed in 0.13.9.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 19.1%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-31814
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cpe:2.3:a:protocol:yamux:0.13.0
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cpe:2.3:a:protocol:yamux:0.13.1
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cpe:2.3:a:protocol:yamux:0.13.2
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cpe:2.3:a:protocol:yamux:0.13.3
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cpe:2.3:a:protocol:yamux:0.13.4
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cpe:2.3:a:protocol:yamux:0.13.5
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cpe:2.3:a:protocol:yamux:0.13.6
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cpe:2.3:a:protocol:yamux:0.13.7
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cpe:2.3:a:protocol:yamux:0.13.8