CVE-2026-34209

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/31/2026

Last Modified4/3/2026

Sourcenvd

Honeypot Sightings0

Affected Products

wevm:mppx

Weaknesses (CWE)

CWE-294

References

https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb(security-advisories@github.com)

https://github.com/wevm/mppx/releases/tag/mppx@0.4.11(security-advisories@github.com)

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

IOC Correlations

No correlations recorded

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