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.
Metrics
Affected Vendors & Products
References
History
Fri, 03 Apr 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:wevm:mppx:*:*:*:*:*:node.js:*:* |
Thu, 02 Apr 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 01 Apr 2026 02:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Wevm
Wevm mppx |
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| Vendors & Products |
Wevm
Wevm mppx |
Tue, 31 Mar 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | mppx: Tempo has a session close voucher bypass vulnerability due to settled amount equality | |
| Weaknesses | CWE-294 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-31T14:10:46.416Z
Updated: 2026-04-02T15:13:32.047Z
Reserved: 2026-03-26T15:57:52.324Z
Link: CVE-2026-34209
Updated: 2026-04-02T15:13:26.917Z
Status : Analyzed
Published: 2026-03-31T15:16:18.030
Modified: 2026-04-03T15:59:37.143
Link: CVE-2026-34209
No data.