CVE-2026-34209

Published: Mar 31, 2026Modified: Jul 24, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitability: 3.9 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

Description

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.

Affected (1)

Products: Wevm: Mppx

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Wevm Mppx	Before 0.4.11

Related CWEs

Authentication Bypass by Capture-replay

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).

References (3)

https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb

Source: security-advisories@github.com

Patch

https://github.com/wevm/mppx/releases/tag/mppx@0.4.11

Source: security-advisories@github.com

Release Notes

https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr

Source: security-advisories@github.com

PatchVendor Advisory

Timeline

No history available yet.