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CVE-2026-63628— mppx: Gas Draining with access list

Quick assessment

Affected
wevm mppx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 E

CVSS 6.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
wevm mppx < 0.8.2 affected
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I. Basic Information for CVE-2026-63628

Vulnerability Information

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Vulnerability Title
mppx: Gas Draining with access list
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wevm mppx < 0.8.2 -

II. Public POCs for CVE-2026-63628

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III. Intelligence Information for CVE-2026-63628

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Other References for CVE-2026-63628 (4)

IV. Related Vulnerabilities

Same product: mppx
Same vendor: wevm
Same weakness: CWE-20

V. Comments for CVE-2026-63628

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