CVE-2026-34209 (GCVE-0-2026-34209)

Vulnerability from cvelistv5 – Published: 2026-03-31 14:10 – Updated: 2026-04-02 15:13
VLAI?
Title
mppx: Tempo has a session close voucher bypass vulnerability due to settled amount equality
Summary
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.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-294 - Authentication Bypass by Capture-replay
Assigner
References
Impacted products
Vendor Product Version
wevm mppx Affected: < 0.4.11
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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