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CVE-2026-59694— Unbounded access list in mpp Tempo fee-payer inflates gas cost per payment

Quick assessment

Affected
ZenHive mpp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZenHive MPP是ZenHive组织开源的一个高性能计算服务器。 ZenHive mpp 0.2.0版本至0.6.0之前版本存在输入验证错误漏洞，该漏洞源于对输入中指定数量验证不当，可能导致未经身份验证的远程客户端通过提交恶意EIP-2930访问列表条目，大幅增加费用支付方的Gas成本，从而破坏赞助商运营利润率。

AI Predicted 5.3 Difficulty: Easy EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1588.006 · Vulnerabilities

Affected Version Matrix 2

VendorProduct Version RangeStatus
ZenHive mpp 0.2.0< 0.6.0 affected
d29d54e507918db00a5b65d90136b73166c017d7< 5d6338e2334084c5f2a78cfcca474830733ed7e8 affected
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I. Basic Information for CVE-2026-59694

Vulnerability Information
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Vulnerability Title
Unbounded access list in mpp Tempo fee-payer inflates gas cost per payment
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per payment by a large multiplier, degrading the sponsor's operating margin. When the mpp Elixir library is configured as fee payer (fee_payer: true), MPP.Tempo.Transaction.cosign_fee_payer/3 re-signs the client-supplied base fields of the 0x76 AASigned envelope verbatim, including the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid transferWithMemo call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work. At the maintainer's default of 137 access-list entries (fitting within Bandit's 10,000-byte per-header-field limit) and 100 Gwei max_fee_per_gas, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor's operating margin on low-cost payments and, over time, drains the fee-payer wallet. This issue affects mpp: from 0.2.0 before 0.6.0.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
ZenHive MPP 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZenHive MPP是ZenHive组织开源的一个高性能计算服务器。 ZenHive mpp 0.2.0版本至0.6.0之前版本存在输入验证错误漏洞，该漏洞源于对输入中指定数量验证不当，可能导致未经身份验证的远程客户端通过提交恶意EIP-2930访问列表条目，大幅增加费用支付方的Gas成本，从而破坏赞助商运营利润率。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZenHive mpp 0.2.0 ~ 0.6.0 cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*
ZenHive mpp d29d54e507918db00a5b65d90136b73166c017d7 ~ 5d6338e2334084c5f2a78cfcca474830733ed7e8 cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-59694

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III. Intelligence Information for CVE-2026-59694

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Vendor Advisories for CVE-2026-59694 (3)

Same Patch Batch · ZenHive · 2026-07-17 · 3 CVEs total

CVE-2026-59695 Unbounded max_fee_per_gas in mpp Tempo fee-payer enables single-request wallet drain
CVE-2026-59252 Missing gas_limit validation in mpp Tempo fee-payer enables wallet drain

IV. Related Vulnerabilities

Same product: mpp
Same vendor: ZenHive
Same weakness: CWE-1284

V. Comments for CVE-2026-59694

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