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...

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...

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: 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...