CVE-2026-34209

HIGH EPSS 27.8%
Published Mar 31, 20263mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Mar 31, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
27.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-294

Affected Products 1

VendorProductVersionRange
wevmmppx* <0.4.11

References 3

  • github.com https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb
    Patch
  • github.com https://github.com/wevm/mppx/releases/tag/mppx@0.4.11
    Release Notes
  • github.com https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr
    PatchVendor Advisory

Remediation

  • github.com https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb
    Patch
  • github.com https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr
    PatchVendor Advisory