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Back to active CVEs
High · CVSS 8.3CVE-2026-82750

Unbounded EIP-7702 authorization list in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors account delegationCVE-2026-82750

Answer in brief

CVE-2026-82750 records a High severity (CVSS 8.3) vulnerability in Unbounded EIP-7702 authorization list in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors account delegation. The current sources do not mark it as known exploited. The current feed maps ZenHive/mpp (generic), ZenHive/mpp (generic), ZenHive/zenhive/mpp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 6, 2026Updated Sep 8, 2026Source checked Oct 25, 2026First seen by HOL Sep 6, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ZenHive/mpp (generic), ZenHive/mpp (generic), ZenHive/zenhive/mpp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ZenHive/mppgeneric>=d29d54e507918db00a5b65d90136b73166c017d7 <0482572b47e1ffe1537ab80ab613d47b92833c2d0482572b47e1ffe1537ab80ab613d47b92833c2d
ZenHive/mppgeneric>=0.2.0 <0.16.10.16.1
ZenHive/zenhive/mppgeneric>=d29d54e507918db00a5b65d90136b73166c017d7 <0482572b47e1ffe1537ab80ab613d47b92833c2d0482572b47e1ffe1537ab80ab613d47b92833c2d

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ZenHive/mpp, ZenHive/mpp, ZenHive/zenhive/mpp.
  2. 2Review the reported fix. Source-reported workaround: Disable Tempo fee sponsorship by leaving "fee_payer" at its default of false and setting no fee_payer_url, so the client pays its own gas. Where sponsorship must stay enabled, lower the max_gas override in fee_payer_policy to just above what a legitimate sponsored payment needs (a TIP-20 transfer is roughly 50,000 gas), so an envelope padded with delegations either fails the policy or runs out of gas at a bounded cost. This bounds the inflation without closing it.

Evidence timeline and material changes

  1. Published upstream

    Sep 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 6, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source 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 EIP-7702 account delegations of the client's choosing. 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 never reads its aa_authorization_list field. Every signed delegation in that list is charged as intrinsic gas before the payment call runs, so a client attaching delegations from throwaway authority keys makes the sponsor pay for them within the default gas_limit ceiling. At the reporter's default of seven entries the sponsored cost rises from about 46,575 gas to about 1,884,087 gas. Because each entry is applied as a persistent set-code delegation, a client can also upgrade its own accounts to delegated code at the sponsor's expense. This issue affects mpp: from 0.2.0 before 0.16.1.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-1284
Source
CVE List V5
Source checked
Oct 25, 2026
References
4 linked sources
Open source record