CVE Watch22 sept 2026

CVE-2026-63627

mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, FeePayerPolicy in src/tempo/internal/fee-payer.ts used decodeF

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, FeePayerPolicy in src/tempo/internal/fee-payer.ts used decodeFunctionData to validate fee-sponsored calldata but did not reject trailing bytes. A client could append nonzero padding that increased intrinsic calldata gas while gas_limit and max_fee_per_gas remained within policy caps, causing the server fee_payer wallet to pay substantially more than the decoded transaction required. The tested 16 KB header limit bounded the demonstrated padding to about 5,500 bytes and produced approximately five times the normal transaction fee. This issue is fixed in version 0.8.2.

Referencias oficiales

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