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CVE-2026-82751— Unbounded key authorization in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors access-key provisioning

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组织开源的一款嵌入式服务器。 ZenHive MPP 0.2.0版本至0.16.1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的验证不当，lib/mpp/methods/tempo/fee_payer_policy.ex文件中的MPP.Methods.Tempo.FeePayerPolicy.measure/3函数未检查客户端签名的0x76信封是否携带可选的key_authorization字段，可能导致未经身份验证的远程客户端将每笔赞助支付的gas费用大

CVSS 8.3 · High EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
ZenHive mpp 0.2.0< 0.16.1 affected
d29d54e507918db00a5b65d90136b73166c017d7< 0482572b47e1ffe1537ab80ab613d47b92833c2d affected
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I. Basic Information for CVE-2026-82751

Vulnerability Information
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Vulnerability Title
Unbounded key authorization in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors access-key provisioning
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 sponsored payment by a large multiplier and to have the sponsor pay for provisioning an access key on the client's own account. When the server sponsors Tempo payments, MPP.Methods.Tempo.FeePayerPolicy.measure/3 in lib/mpp/methods/tempo/fee_payer_policy.ex bounds the gas fields, the fee budget, the validity window and the access list of the client-signed 0x76 envelope, but does not check whether the envelope carries the optional key_authorization field. A client can attach a fully signed key authorization, provisioning a new access key with token spending limits on its own account, alongside the normal payment call. The key and each limit entry are persistent storage writes billed as intrinsic gas to the sponsor, bounded only by the gas_limit ceiling. At the reporter's default of one key with three token limits the sponsored cost rises from about 46,587 gas to about 1,808,700 gas, and the client keeps a valid access key it paid nothing for. This issue affects mpp: from 0.2.0 before 0.16.1.
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组织开源的一款嵌入式服务器。 ZenHive MPP 0.2.0版本至0.16.1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的验证不当，lib/mpp/methods/tempo/fee_payer_policy.ex文件中的MPP.Methods.Tempo.FeePayerPolicy.measure/3函数未检查客户端签名的0x76信封是否携带可选的key_authorization字段，可能导致未经身份验证的远程客户端将每笔赞助支付的gas费用大
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 ~ 0.16.1 cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*
ZenHive mpp d29d54e507918db00a5b65d90136b73166c017d7 ~ 0482572b47e1ffe1537ab80ab613d47b92833c2d cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82751

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III. Intelligence Information for CVE-2026-82751

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Vendor Advisories for CVE-2026-82751 (3)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-82751

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