High 7.5Published Mar 31, 2026

CVE-2026-34209mppx is a TypeScript interface for machine payments protocol.

Updated under an hour ago (2026-10-19 09:40 UTC)

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It affects wevm mppx. 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 wevm mppx

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A: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: Not given
NVD analysis: Analyzed
Record last updated: Jul 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

wevm mppx wevm:mppx	before 0.4.11	NVD

References

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-j8mrpatch, vendor-advisory

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.