CVE-2026-59694Public exploitNetwork attack vector

Fee-payer cost inflation via unbounded access list

Published Jul 17, 2026 · Updated Jul 17, 2026

Improper input validation in ZenHive MPP 0.2.0 through versions before 0.6.0 allows remote attackers to inflate sponsored transaction fees. MPP.Tempo.Transaction.cosign_fee_payer/3 re-signs client-supplied 0x76 envelope base fields without bounding or rejecting the EIP-2930 access list. The path requires Tempo fee_payer: true; fabricated entries add intrinsic gas before execution, multiplying the sponsor's cost while the intended transfer still completes.

CVSS severity8.3
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in ZenHive MPP 0.2.0 through versions before 0.6.0 allows remote attackers to inflate sponsored transaction fees. MPP.Tempo.Transaction.cosign_fee_payer/3 re-signs client-supplied 0x76 envelope base fields without bounding or rejecting the EIP-2930 access list. The path requires Tempo fee_payer: true; fabricated entries add intrinsic gas before execution, multiplying the sponsor's cost while the intended transfer still completes.

The record

CVE
CVE-2026-59694
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
ZenHive
Product
MPP
Classifications
CWE-1284, CAPEC-130
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 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 <0.6.0
  2. Affected versionversion=d29d54e507918db00a5b65d90136b73166c017d7 <5d6338e2334084c5f2a78cfcca474830733ed7e8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ZenHive · MPPversion=0.2.0 <0.6.0; version=d29d54e507918db00a5b65d90136b73166c017d7 <5d6338e2334084c5f2a78cfcca474830733ed7e8

Published CVSS scores

8.3Erlang Ecosystem FoundationCVSS: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 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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CAPEC-130Excessive Allocation

Public exploit references

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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