CVE-2026-73541
Tempo fee sponsorship in mpp bounds each transaction but not aggregate exposure, allowing concurrent sponsor-wallet drain
Description
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. MPP.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 <= 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. This issue affects mpp: from 0.2.0 before 0.12.0.
INFO
Published Date :
Aug. 19, 2026, 6:17 p.m.
Last Modified :
Aug. 19, 2026, 7:17 p.m.
Remotely Exploit :
Yes !
Source :
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | ||||
| CVSS 4.0 | HIGH | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db |
Solution
- Update mpp to version 0.12.0 or later.
- Implement transaction rate limiting.
- Enforce concurrent sponsored transaction limits.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-73541.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-73541 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-73541
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-73541 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-73541 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 19, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-73541', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-19T18:45:45.477502Z'} -
New CVE Received by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/ZenHive/mpp', 'vendor': 'ZenHive', 'modules': ["'Elixir.MPP.Methods.Tempo.FeePayerPolicy'", "'Elixir.MPP.Methods.Tempo'"], 'product': 'mpp', 'versions': [{'status': 'affected', 'version': '0.2.0', 'lessThan': '0.12.0', 'versionType': 'semver'}], 'packageURL': 'pkg:hex/mpp', 'packageName': 'mpp', 'programFiles': ['lib/mpp/methods/tempo/fee_payer_policy.ex', 'lib/mpp/methods/tempo.ex'], 'collectionURL': 'https://repo.hex.pm', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.MPP.Methods.Tempo.FeePayerPolicy':validate/3"}, {'name': "'Elixir.MPP.Methods.Tempo':verify/2"}]}, {'cpes': ['cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/ZenHive/mpp', 'vendor': 'ZenHive', 'modules': ["'Elixir.MPP.Methods.Tempo.FeePayerPolicy'", "'Elixir.MPP.Methods.Tempo'"], 'product': 'mpp', 'versions': [{'status': 'affected', 'version': 'd29d54e507918db00a5b65d90136b73166c017d7', 'lessThan': 'ddc46868fba57ccebb567c04709812b466123076', 'versionType': 'git'}], 'packageURL': 'pkg:github/zenhive/mpp', 'packageName': 'zenhive/mpp', 'programFiles': ['lib/mpp/methods/tempo/fee_payer_policy.ex', 'lib/mpp/methods/tempo.ex'], 'collectionURL': 'https://github.com', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.MPP.Methods.Tempo.FeePayerPolicy':validate/3"}, {'name': "'Elixir.MPP.Methods.Tempo':verify/2"}]}] Added Description 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. MPP.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 <= 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. This issue affects mpp: from 0.2.0 before 0.12.0. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-770 Added Reference https://cna.erlef.org/cves/CVE-2026-73541.html Added Reference https://github.com/ZenHive/mpp/commit/ddc46868fba57ccebb567c04709812b466123076 Added Reference https://github.com/ZenHive/mpp/security/advisories/GHSA-j4j7-7xpr-c7cr Added Reference https://osv.dev/vulnerability/EEF-CVE-2026-73541