CVE Watch22 sept 2026

CVE-2026-63628

mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, the fee-payer cosigning path in src/tempo/internal/fee-payer.t

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 22 sept 2026 · Última mod.: 22 sept 2026 · CWE-20

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, the fee-payer cosigning path in src/tempo/internal/fee-payer.ts copied a client-supplied access_list from a 0x78 FeePayerEnvelope without validating its length or contents. Because EIP-2930 access-list entries consume intrinsic gas even when the listed addresses are never used, a client could add fabricated address-only entries and cause the server fee_payer wallet to pay unnecessary transaction fees. The demonstrated 180-entry list remained within the 500,000 gas policy cap, 16 KB header limit, and RPC simulation budget while increasing the fee by approximately 9.4 times. This issue is fixed in version 0.8.2.

Referencias oficiales

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