CVE-2026-63628
— UNSCOREDpublic exploit availablePublished 2026-09-22 · Updated 2026-09-24
AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.
NVD 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.
Weaknesses
CWE-20
Public exploit & PoC references
- https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25
- https://github.com/wevm/mppx/pull/602
- https://github.com/wevm/mppx/releases/tag/[email protected]
- https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj
- https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj
All references
- https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25
- https://github.com/wevm/mppx/pull/602
- https://github.com/wevm/mppx/releases/tag/[email protected]
- https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj
- https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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