CVE-2026-31814 HIGH

CVE-2026-31814: Yamux remote Panic via malformed WindowUpdate credit

Vendor Libp2P
Product rust-yamux
Weakness CWE-190
Published March 13, 2026
Last update March 13, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 13, 2026 CVE published
March 13, 2026 Record updated