← CVE Intelligence

CVE-2026-34209

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

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
wevm / mppxaffected < 0.4.11

CWE

CWE-294

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.