{"id":"CVE-2026-63628","revision":"9bcfdfdf07214156b7600c1fed2e4634","records":[{"revision":"9bcfdfdf07214156b7600c1fed2e4634","observedAt":"2026-10-25T15:18:45.851+00:00","statement":{"source":"nvd","id":"CVE-2026-63628","aliases":[],"title":"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…","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.","state":0,"publishedAt":"2026-09-22T20:17:04.913+00:00","modifiedAt":"2026-09-24T15:17:26.803+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25","https://github.com/wevm/mppx/pull/602","https://github.com/wevm/mppx/releases/tag/mppx@0.8.2","https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63628","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-20"],"productCriteria":[],"sourceDates":{"published":"2026-09-22T20:17:04.913","lastModified":"2026-09-24T15:17:26.803"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-63628","identifiers":["CVE-2026-63628"]},"retained":false,"historicalAffected":[]}],"coverage":[]}