CVE-2026-82750
- Source
- https://cve.org/CVERecord?id=CVE-2026-82750
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82750.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-82750
- Aliases
-
- EEF-CVE-2026-82750
- GHSA-5qrp-r24c-w6jr
- Published
- 2026-09-06T16:08:41Z
- Modified
- 2026-09-10T03:30:51Z
- Severity
-
- 8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Unbounded EIP-7702 authorization list in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors account delegation
- Details
-
Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per sponsored payment by a large multiplier and to have the sponsor pay for EIP-7702 account delegations of the client's choosing.
When the server sponsors Tempo payments, MPP.Methods.Tempo.FeePayerPolicy.measure/3 in lib/mpp/methods/tempo/fee_payer_policy.ex bounds the gas fields, the fee budget, the validity window and the access list of the client-signed 0x76 envelope, but never reads its aa_authorization_list field. Every signed delegation in that list is charged as intrinsic gas before the payment call runs, so a client attaching delegations from throwaway authority keys makes the sponsor pay for them within the default gas_limit ceiling. At the reporter's default of seven entries the sponsored cost rises from about 46,575 gas to about 1,884,087 gas. Because each entry is applied as a persistent set-code delegation, a client can also upgrade its own accounts to delegated code at the sponsor's expense.
This issue affects mpp: from 0.2.0 before 0.16.1.
- Database specific
{ "cna_assigner": "EEF", "cwe_ids": [ "CWE-1284" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82750.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "0.2.0" }, { "fixed": "0.16.1" }, { "introduced": "d29d54e507918db00a5b65d90136b73166c017d7" }, { "fixed": "0482572b47e1ffe1537ab80ab613d47b92833c2d" } ], "source": "AFFECTED_FIELD" }, { "extracted_events": [ { "introduced": "0.2.0" }, { "fixed": "0.16.1" } ], "source": "CPE_FIELD" }, { "extracted_events": [ { "introduced": "0.2.0" }, { "fixed": "0.16.1" } ], "source": "DESCRIPTION" } ] }- References
-
- https://cna.erlef.org/cves/CVE-2026-82750.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-82750
- https://repo.hex.pm
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82750.json
- https://github.com/ZenHive/mpp/security/advisories/GHSA-5qrp-r24c-w6jr
- https://nvd.nist.gov/vuln/detail/CVE-2026-82750
- https://github.com/ZenHive/mpp/commit/0482572b47e1ffe1537ab80ab613d47b92833c2d
- https://github.com/ZenHive/mpp