CVE-2026-34209 in wevm mppxinfo

Summary

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.

Responsible

GitHub_M

Reservation

03/26/2026

Disclosure

03/31/2026

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VulDB provides additional information and datapoints for this CVE:

IDVulnerabilityCWEExpCouCVE
354397wevm mppx authentication replay294Not definedOfficial fixCVE-2026-34209

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