Kurz gesagt
- CVE-2026-34209 ist eine Schwachstelle (HOCH (CVSS 7.5)) in mppx (wevm), mppx.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.37%, höher als bei 31.4% aller Schwachstellen.
- Abhilfe: auf 0.4.11 oder neuer aktualisieren.
| Package | Affected versions | Patched versions |
|---|
| mppx | < 0.4.11
| 0.4.11
|
| mppx npm | < 0.4.11
| 0.4.11
|
Description
Impact
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.
Patches
Fixed in 0.4.11.
Workarounds
There are no workarounds available for this vulnerability.
NVD 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.
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