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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-4w32-2493-32g7 Yamux vulnerable to remote Panic via malformed WindowUpdate credit
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 19 Mar 2026 14:00:00 +0000

Type Values Removed Values Added
First Time appeared Protocol
Protocol yamux
CPEs cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*
Vendors & Products Protocol
Protocol yamux
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Mon, 16 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Libp2p
Libp2p rust-yamux
Vendors & Products Libp2p
Libp2p rust-yamux

Fri, 13 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 13 Mar 2026 19:30:00 +0000

Type Values Removed Values Added
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.
Title Yamux remote Panic via malformed WindowUpdate credit
Weaknesses CWE-190
References
Metrics cvssV4_0

{'score': 8.7, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-13T19:38:02.290Z

Reserved: 2026-03-09T16:33:42.914Z

Link: CVE-2026-31814

cve-icon Vulnrichment

Updated: 2026-03-13T19:37:58.086Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-13T19:54:36.470

Modified: 2026-03-19T13:51:44.067

Link: CVE-2026-31814

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-16T09:24:20Z

Weaknesses