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CVE-2026-34209

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • mppx

    Versions
    • < 0.4.11: Affected

    No fix published

  • mppx npm

    Affected ranges
    • SEMVER: < 0.4.11

    Update to 0.4.11

Original sources

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