mppx: Tempo has a session close voucher bypass vulnerability due to settled amount equality

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Summary

CVECVE-2026-34209
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 15:16:18 UTC
Updated2026-04-01 14:24:02 UTC
Descriptionmppx 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.000260000 probability, percentile 0.072290000 (date 2026-04-01)

Problem Types: CWE-294 | CWE-294 CWE-294: Authentication Bypass by Capture-replay

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wevm Mppx affected < 0.4.11 Not specified

References

ReferenceSourceLinkTags
github.com/wevm/mppx/releases/tag/[email protected] [email protected] github.com
github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr [email protected] github.com
github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb [email protected] github.com
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