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CVE-2026-59695— Unbounded max_fee_per_gas in mpp Tempo fee-payer enables single-request wallet drain

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至0.6.0之前版本存在输入验证错误漏洞，该漏洞源于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指定任意高gas价格，在单个请求中耗尽费用支付钱包。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-59695

Vulnerability Information
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Vulnerability Title
Unbounded max_fee_per_gas in mpp Tempo fee-payer enables single-request wallet drain
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet in a single request by naming an arbitrarily high gas price. 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 max_fee_per_gas and max_priority_fee_per_gas, without validating that they are within reasonable bounds. A malicious client embeds arbitrarily large values for these fields in the signed envelope. The server co-signs and broadcasts the transaction. The effective_gas_price billed against the fee-payer wallet is derived from the attacker-supplied ceilings, so the server pays those inflated per-gas rates out of its own wallet. A single crafted request can drain the wallet entirely, after which the server can no longer sponsor gas for legitimate payment requests. 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:H/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至0.6.0之前版本存在输入验证错误漏洞，该漏洞源于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指定任意高gas价格，在单个请求中耗尽费用支付钱包。
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-2026-59695

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III. Intelligence Information for CVE-2026-59695

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Vendor Advisories for CVE-2026-59695 (3)

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

CVE-2026-59694 Unbounded access list in mpp Tempo fee-payer inflates gas cost per payment
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-2026-59695

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