{"id":"CVE-2026-34209","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-34209","generatedAt":"2026-10-28T05:59:26.021Z","title":"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.","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.","published":"2026-03-31T15:16:18.000Z","lastModified":"2026-07-24T21:10:00.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-294"],"affected":["wevm/mppx"],"epss":{"score":0.00359,"percentile":0.29438,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfb","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/wevm/mppx/releases/tag/mppx@0.4.11","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mr","tags":["Patch","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-34209","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}