Improper Input Validation

mppx is vulnerable to improper input validation. The vulnerability is due to improper validation in the cooperative close handler, where the close voucher amount was checked using “” instead of “=” against the on-chain settled amount, which allows an attacker to submit a close voucher equal to th...

mppx: Tempo has a session close voucher bypass vulnerability due to settled amount equality

Impact 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...

PT-2026-28607

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...