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CVE-2026-34209 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb	[email protected]	Patch
https://github.com/wevm/mppx/releases/tag/[email protected]	[email protected]	Release Notes
https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr	[email protected]	PatchVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-294	Authentication Bypass by Capture-replay	[email protected]

Affected Products

Product	Versions
wevm mppx	< 0.4.11
CPE cpe:2.3:a:wevm:mppx::::::node.js::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jul 24, 2026	CVE Translated	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Apr 3, 2026	Initial Analysis	[email protected]
Mar 31, 2026	New CVE Received	[email protected]