CVE-2026-73541Network attack vector

Sponsor-wallet drain via unbounded concurrent sponsorship

Published Aug 19, 2026 · Updated Aug 19, 2026

Resource exhaustion in ZenHive MPP before 0.12.0 allows remote attackers to drain the sponsor wallet via concurrent sponsored payments. MPP.Methods.Tempo.FeePayerPolicy validates max_gas, fee caps, max_total_fee, and a validity window one transaction at a time, but it does not track or cap aggregate in-flight sponsor exposure across distinct requests and nonces. Only deployments with Tempo server-side fee sponsorship enabled are affected; sponsorship is disabled by default, and later legitimate payments fail once concurrent reservations consume or empty the sponsor wallet.

CVSS severity8.3
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in ZenHive MPP before 0.12.0 allows remote attackers to drain the sponsor wallet via concurrent sponsored payments. MPP.Methods.Tempo.FeePayerPolicy validates max_gas, fee caps, max_total_fee, and a validity window one transaction at a time, but it does not track or cap aggregate in-flight sponsor exposure across distinct requests and nonces. Only deployments with Tempo server-side fee sponsorship enabled are affected; sponsorship is disabled by default, and later legitimate payments fail once concurrent reservations consume or empty the sponsor wallet.

The record

CVE
CVE-2026-73541
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
ZenHive
Product
MPP
Classifications
CWE-770, CAPEC-130, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.2.0 <0.12.0
  2. Affected versionversion=d29d54e507918db00a5b65d90136b73166c017d7 <ddc46868fba57ccebb567c04709812b466123076

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ZenHive · MPPversion=0.2.0 <0.12.0; version=d29d54e507918db00a5b65d90136b73166c017d7 <ddc46868fba57ccebb567c04709812b466123076

Published CVSS scores

8.3EEFCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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