{"id":"GHSA-8x4m-qw58-3pcx","aliases":[],"status":"published","title":"mppx has multiple payment bypass and griefing vulnerabilities","description":"### Impact\n\nMultiple vulnerabilities were discovered in `tempo/charge` and `tempo/session` which allowed for undesirable behaviors, including:\n- Replaying `tempo/charge` transaction hashes across push/pull modes, across charge/session endpoints, and via concurrent requests\n- Performing free `tempo/charge` requests due to missing transfer log verification in pull-mode\n- Replaying `tempo/charge` credentials across routes via cross-route scope confusion (`memo`/`splits` not included in scope binding)\n- Manipulating the fee payer of a `tempo/charge` handler into paying for requests (missing sender signature before co-signing)\n- Bypassing `tempo/session` voucher signature verification\n- Piggybacking off existing `tempo/session` channels via settle voucher reuse and weak channel ID binding\n- Performing free `tempo/session` requests by exploiting channel reopen without on-chain settled state\n- Accepting deductions on finalized `tempo/session` channels\n- Bypassing payment on free routes via method-mismatch fallback\n- Griefing `tempo/session` channels via force-close detection bypass (`closeRequestedAt` not persisted)\n\n### Patches\n\nFixed in 0.4.8.\n\n### Workarounds\n\nThere are no workarounds available for these vulnerabilities.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N","level":"critical","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-288","CWE-294","CWE-345"],"published":"2026-03-29T15:15:36Z","modified":"2026-03-29T15:35:52Z","fixes":[{"ecosystem":"npm","package":"mppx","fixed_in":["0.4.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"mppx","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.8"}]}]},{"source":"osv","ecosystem":"npm","package":"mppx","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.4.8"}]}]}],"references":[{"url":"https://github.com/wevm/mppx/security/advisories/GHSA-8x4m-qw58-3pcx","tags":["web"]},{"url":"https://github.com/advisories/GHSA-8x4m-qw58-3pcx"},{"url":"https://github.com/wevm/mppx","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-8x4m-qw58-3pcx","title":"mppx has multiple payment bypass and griefing vulnerabilities","description":"### Impact\n\nMultiple vulnerabilities were discovered in `tempo/charge` and `tempo/session` which allowed for undesirable behaviors, including:\n- Replaying `tempo/charge` transaction hashes across push/pull modes, across charge/session endpoints, and via concurrent requests\n- Performing free `tempo/charge` requests due to missing transfer log verification in pull-mode\n- Replaying `tempo/charge` credentials across routes via cross-route scope confusion (`memo`/`splits` not included in scope binding)\n- Manipulating the fee payer of a `tempo/charge` handler into paying for requests (missing sender signature before co-signing)\n- Bypassing `tempo/session` voucher signature verification\n- Piggybacking off existing `tempo/session` channels via settle voucher reuse and weak channel ID binding\n- Performing free `tempo/session` requests by exploiting channel reopen without on-chain settled state\n- Accepting deductions on finalized `tempo/session` channels\n- Bypassing payment on free routes via method-mismatch fallback\n- Griefing `tempo/session` channels via force-close detection bypass (`closeRequestedAt` not persisted)\n\n### Patches\n\nFixed in 0.4.8.\n\n### Workarounds\n\nThere are no workarounds available for these vulnerabilities.","status":"published","published":"2026-03-29T15:15:36Z","modified":"2026-03-29T15:15:37Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N","level":"critical"}],"cwes":["CWE-288","CWE-294","CWE-345"],"updated_at":"2026-11-02T14:39:44.97342Z"}],"osv":[{"id":"GHSA-8x4m-qw58-3pcx","title":"mppx has multiple payment bypass and griefing vulnerabilities","description":"### Impact\n\nMultiple vulnerabilities were discovered in `tempo/charge` and `tempo/session` which allowed for undesirable behaviors, including:\n- Replaying `tempo/charge` transaction hashes across push/pull modes, across charge/session endpoints, and via concurrent requests\n- Performing free `tempo/charge` requests due to missing transfer log verification in pull-mode\n- Replaying `tempo/charge` credentials across routes via cross-route scope confusion (`memo`/`splits` not included in scope binding)\n- Manipulating the fee payer of a `tempo/charge` handler into paying for requests (missing sender signature before co-signing)\n- Bypassing `tempo/session` voucher signature verification\n- Piggybacking off existing `tempo/session` channels via settle voucher reuse and weak channel ID binding\n- Performing free `tempo/session` requests by exploiting channel reopen without on-chain settled state\n- Accepting deductions on finalized `tempo/session` channels\n- Bypassing payment on free routes via method-mismatch fallback\n- Griefing `tempo/session` channels via force-close detection bypass (`closeRequestedAt` not persisted)\n\n### Patches\n\nFixed in 0.4.8.\n\n### Workarounds\n\nThere are no workarounds available for these vulnerabilities.","status":"published","published":"2026-03-29T15:15:36Z","modified":"2026-03-29T15:35:52.545768Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N","level":"critical"}],"cwes":["CWE-288","CWE-294","CWE-345"],"updated_at":"2026-11-02T15:46:42.78452Z"}]}}