CVE-2026-34209 | BDVDB-2026-323942 Detail

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.

Impact#

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Exploit#

History#

1. Version 12026-03-31Record published in the CVE List.
2. Version 22026-04-02Most recent update recorded in the CVE List.