CVE-2026-31814 is a high-severity arithmetic overflow vulnerability affecting Yamux protocol versions 0.13.0 through 0.13.8. This flaw allows an unauthenticated, remote attacker to trigger a denial of service by sending a specially crafted WindowUpdate, causing the connection state machine to panic. With a CVSS score of 7.5, the vulnerability has a low attack complexity and a high impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion regarding this vulnerability. Organizations using affected Yamux versions should upgrade to 0.13.9 to mitigate this risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0.13.0, < 0.13.9CPE matchmatch criteria | cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:* |
CVSS version used by this source: 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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