CVE-2026-31814
Yamux remote Panic via malformed WindowUpdate credit
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.7EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
13 Mar 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
libp2p · rust-yamuxWant to know if your infrastructure is exposed to this?
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