wevm mppx up to 0.4.10 authentication replay

Summaryinfo

A vulnerability, which was classified as critical, has been found in wevm mppx up to 0.4.10. Affected is an unknown function. This manipulation causes authentication replay. This vulnerability is tracked as CVE-2026-34209. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in wevm mppx up to 0.4.10 and classified as critical. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a authentication replay vulnerability. The CWE definition for the vulnerability is CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the tempo/session cooperative close handler validated the close voucher amount using "<" instead of "<=" against the on-chain settled amount. An attacker could submit a close voucher exactly equal to the settled amount, which would be accepted without committing any new funds, effectively closing or griefing the channel for free. This issue has been patched in version 0.4.11.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34209 since 03/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1040 for this issue.

Upgrading to version 0.4.11 eliminates this vulnerability.

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Productinfo

Vendor

• wevm

Name

• mppx

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3
• 0.4.4
• 0.4.5
• 0.4.6
• 0.4.7
• 0.4.8
• 0.4.9
• 0.4.10

Website

• Product: https://github.com/wevm/mppx/

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