ZenHive mpp up to 0.6.2 Transaction Verification MPP.Methods.EVM.verify authentication replay

Summaryinfo

A vulnerability described as critical has been identified in ZenHive mpp up to 0.6.2. Impacted is the function MPP.Methods.EVM.verify of the component Transaction Verification. Executing a manipulation can lead to authentication replay. The identification of this vulnerability is CVE-2026-67581. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in ZenHive mpp up to 0.6.2. It has been declared as critical. This vulnerability affects the function MPP.Methods.EVM.verify of the component Transaction Verification. The manipulation with an unknown input leads to a authentication replay vulnerability. The CWE definition for the vulnerability is CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Authentication Bypass by Capture-replay in ZenHive mpp allows an unauthenticated remote client to obtain paid resources by resubmitting one settled on-chain transfer. MPP.Methods.EVM.verify/2 accepts a transaction-hash credential and matches a transfer purely on token, to and amount (ERC-20) or to and value (native). It binds the proof neither to the challenge being verified nor to any record of prior use, and the generic MPP.Plug dedup store keys on challenge.id, which is regenerated for every 402 response. On a static-price route, a single historical transfer matching the charge therefore satisfies an unbounded number of later charges, including transfers an attacker can read off a public block explorer. This issue affects mpp: from 0.3.0 before 0.6.3.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-67581 since 08/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1040.

Upgrading to version 0.6.3 eliminates this vulnerability.

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Productinfo

Vendor

• ZenHive

Name

• mpp

Version

• 0.6.0
• 0.6.1
• 0.6.2

Website

• Product: https://github.com/ZenHive/mpp/

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