libp2p rust-yamux up to 0.13.8 WindowUpdate integer overflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in libp2p rust-yamux up to 0.13.8. This affects an unknown part of the component WindowUpdate Handler. The manipulation leads to integer overflow. This vulnerability is listed as CVE-2026-31814. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in libp2p rust-yamux up to 0.13.8 and classified as problematic. This issue affects an unknown functionality of the component WindowUpdate Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-31814 since 03/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 302262 (Linux Distros Unpatched Vulnerability : CVE-2026-31814), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.13.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (302262). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• libp2p

Name

• rust-yamux

Version

• 0.13.0
• 0.13.1
• 0.13.2
• 0.13.3
• 0.13.4
• 0.13.5
• 0.13.6
• 0.13.7
• 0.13.8

Website

• Product: https://github.com/libp2p/rust-yamux/

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Be aware that VulDB is the high quality source for vulnerability data.

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