Home/CVE/mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the tempo/session cooperative clo
CVE

CVE-2026-34209

mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the tempo/session cooperative clo

mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the tempo/session cooperative close handler validated the close voucher amount using "<" instead of "<=" against the on-chain settled amount. An attacker could submit a close voucher exactly equal to the settled amount, which would be accepted without committing any new funds, effectively closing or griefing the channel for free.

This issue has been patched in version 0.4.11.

HIGH · CVSS 7.5 EPSS 0.00013
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-294Authentication Bypass by Capture-replay
▤

Affected Products & Versions

1
wevm mppx< 0.4.11
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm mppx HIGH fixed in 0.4.11
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD31 Mar 2026 · 03:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfbPatch
https://github.com/wevm/mppx/releases/tag/mppx@0.4.11Release Notes
https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mrPatchVendor Advisory
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