CVE-2026-31814
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductProtocol Yamux
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-190Integer overflow
How to fix
Update
- protocol yamux0.13.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| protocol yamux | 0.13.0 ≤ v < 0.13.9 | 0.13.9 |
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