CVE-2026-34209

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.

• CWE-294

• 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

Published

Mar 31, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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