CVE-2026-34209

mppx: Tempo has a session close voucher bypass vulnerability due to settled amount equality

CVSS 7.5 HIGHEPSS 0.4%CWE-294

Vexday Risk Score

21Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

CVSS 7.5EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

31 mar 2026Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Produtos afetados

wevm · mppx

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Referências

https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb https://github.com/wevm/mppx/releases/tag/mppx@0.4.11 https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr