CVE-2026-34209

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...

CVE-2026-34209 mppx: Tempo has a session close voucher bypass vulnerability due to settled amount equality

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...

Replay Attack

Overview mppx is a /picture Affected versions of this package are vulnerable to Replay Attack through the tempo/charge and tempo/session. An attacker can gain unauthorized access or perform unauthorized actions by replaying transaction hashes, bypassing signature verification, manipulating fee...

GHSA-8X4M-QW58-3PCX mppx has multiple payment bypass and griefing vulnerabilities

Impact Multiple vulnerabilities were discovered in tempo/charge and tempo/session which allowed for undesirable behaviors, including: - Replaying tempo/charge transaction hashes across push/pull modes, across charge/session endpoints, and via concurrent requests - Performing free tempo/charge...

mppx has multiple payment bypass and griefing vulnerabilities

Impact Multiple vulnerabilities were discovered in tempo/charge and tempo/session which allowed for undesirable behaviors, including: - Replaying tempo/charge transaction hashes across push/pull modes, across charge/session endpoints, and via concurrent requests - Performing free tempo/charge...

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...

Replay Attack

Overview mppx is a /picture Affected versions of this package are vulnerable to Replay Attack in the tempo/session cooperative close handler due to improper validation of the close voucher amount. An attacker can bypass intended restrictions by submitting a close voucher with an amount exactly...