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CVE-2026-63627— mppx: Gas Draining with padding

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, 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

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-2026-63627

Vulnerability Information

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Vulnerability Title
mppx: Gas Draining with padding
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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-2026-63627

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III. Intelligence Information for CVE-2026-63627

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Other References for CVE-2026-63627 (4)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-63627

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