High 8.7Published Aug 19, 2026

CVE-2026-67581On-chain transfer proof is not single-use in mpp EVM payment method, enabling cross-challenge replay

Updated under an hour ago (2026-10-19 07:30 UTC)

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It affects ZenHive mpp and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ZenHive mpp

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-294
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: EEF
NVD analysis: Analyzed
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ZenHive mpp zenhive:mpp	from 0.3.0 before 0.6.3	CNA record
zenhive machine_payments_protocol zenhive:machine_payments_protocol	from 0.3.0 before 0.6.4	NVD

References

https://github.com/ZenHive/mpp/security/advisories/GHSA-vp5h-xh25-44wfvendor-advisory, related
https://cna.erlef.org/cves/CVE-2026-67581.htmlrelated, third-party-advisory
https://osv.dev/vulnerability/EEF-CVE-2026-67581related, third-party-advisory
https://github.com/ZenHive/mpp/commit/ecc038088b1cda09ad8a84acc6cc112addb4a68fpatch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.