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 app…
Historical advisory saved 11 Nov 2026 15:06:38 UTC. The publisher may have updated it since then. Latest advisory.
euvd · EUVD-2026-84805
Publishedmppx 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.
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datePublished: Sep 22, 2026, 7:07:02 PM
dateUpdated: Sep 23, 2026, 2:36:37 PM
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- Sep 22, 2026, 7:07:02 PM (timezone not stated)
- Source modified
- Sep 23, 2026, 2:36:37 PM (timezone not stated)
- Saved here
- 11 Nov 2026 15:06:38 UTC
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- ENISA EUVD · source terms and attribution apply
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Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
EUVD CVSS 4.0 · 6.9 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