{"id":"CVE-2026-63627","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-63627","generatedAt":"2026-10-28T08:11:18.471Z","title":"mppx is a TypeScript interface for machine payments protocol.","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.","published":"2026-09-22T20:17:05.000Z","lastModified":"2026-09-23T18:12:04.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","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/M"},"cwe":["CWE-20"],"affected":[],"epss":{"score":0.00524,"percentile":0.44225,"date":"2026-10-27","history":[{"date":"2026-09-23","score":0.00524,"percentile":0.43428}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.52%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-22T20:17:05.000Z","detail":{"score":"6.9","severity":"MEDIUM","publishedAt":"2026-09-22T20:17:04.763Z"},"summary":"New CVE, medium severity (CVSS 6.9)."}],"references":[{"url":"https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25","source":"security-advisories@github.com"},{"url":"https://github.com/wevm/mppx/pull/602","source":"security-advisories@github.com"},{"url":"https://github.com/wevm/mppx/releases/tag/mppx@0.8.2","source":"security-advisories@github.com"},{"url":"https://github.com/wevm/mppx/security/advisories/GHSA-727h-3vm5-qwq6","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63627","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}