{"id":"CVE-2026-73541","summary":"Tempo fee sponsorship in mpp bounds each transaction but not aggregate exposure, allowing concurrent sponsor-wallet drain","details":"Allocation of Resources Without Limits or Throttling in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet through concurrent sponsored payments, denying service to legitimate payers once it is empty.\n\nMPP.Methods.Tempo.FeePayerPolicy enforces its ceilings (max_gas, max_fee_per_gas, max_priority_fee_per_gas, the worst-case gas_limit * max_fee_per_gas \u003c= max_total_fee budget cap, and a validity window) against one transaction at a time, and nothing accounts for exposure across concurrent requests. reserve_hash_atomic/2 is keyed on the transaction hash, so it prevents duplicate broadcast of the same signed transaction but not N distinct sponsored transactions carrying distinct expiring nonces. Committed sponsor exposure is therefore N times max_total_fee, bounded by nothing in the library, and the default 900 second validity window lets co-signed transactions stay broadcastable and uncounted for that entire period.\n\nThis issue affects mpp: from 0.2.0 before 0.12.0.","aliases":["EEF-CVE-2026-73541","GHSA-j4j7-7xpr-c7cr"],"modified":"2026-08-22T03:31:16.216645517Z","published":"2026-08-19T17:20:00.286Z","database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73541.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"d29d54e507918db00a5b65d90136b73166c017d7"},{"fixed":"ddc46868fba57ccebb567c04709812b466123076"}]}],"cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-73541.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-73541"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73541.json"},{"type":"ADVISORY","url":"https://github.com/ZenHive/mpp/security/advisories/GHSA-j4j7-7xpr-c7cr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73541"},{"type":"FIX","url":"https://github.com/ZenHive/mpp/commit/ddc46868fba57ccebb567c04709812b466123076"},{"type":"PACKAGE","url":"https://github.com/ZenHive/mpp"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zenhive/mpp","events":[{"introduced":"7ca7538f05959a98e0e5e63e4bd949b4f362cf8d"},{"fixed":"a23dabd1aa066479b3acd1915ccc1644c3b66b34"},{"fixed":"ddc46868fba57ccebb567c04709812b466123076"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0.2.0"},{"fixed":"0.12.0"}]}}],"versions":["v0.11.0","v0.10.0","v0.9.0","v0.8.0","v0.7.0","v0.6.4","v0.6.3","v0.6.1","v0.6.0","v0.5.1","v0.4.0","v0.3.0","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73541.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"}]}