{"id":"CVE-2026-107297","aliases":["AZL-106842","CLSA-2026-1791806348","CLSA-2026-1793302953","EUVD-2026-95108","GHSA-gcx5-hxj7-gpqq"],"status":"published","title":"msgpack5: Quadratic parsing in the streaming decoder","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00389,"percentile":0.33465,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-407"],"published":"2026-10-08T17:07:03Z","modified":"2026-10-30T02:15:06Z","fixes":[{"ecosystem":"npm","package":"msgpack5","fixed_in":["6.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"msgpack5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.0"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"msgpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.3.0-1"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"msgpack5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.1-tuxcare.0"},{"fixed":"4.5.1-tuxcare.1"}]}],"versions":["4.5.1"],"bundled":5},{"source":"osv","ecosystem":"TuxCare:npm","package":"msgpack5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.6.1-tuxcare.0"},{"fixed":"3.6.1-tuxcare.1"}]}],"versions":["3.6.1"],"bundled":7},{"source":"osv","ecosystem":"npm","package":"msgpack5","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.1.0"}]}]}],"products":[{"vendor":"mcollina","product":"msgpack5"}],"references":[{"url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-gcx5-hxj7-gpqq","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/mcollina/msgpack5/commit/e4827641d3105e295cbbd56e9c5389978547eab4","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-gcx5-hxj7-gpqq"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107297","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107297.json","tags":["advisory"]},{"url":"https://github.com/mcollina/msgpack5","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-107297","title":"msgpack5: Quadratic parsing in the streaming decoder","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.","status":"published","published":"2026-10-08T17:07:03.74Z","modified":"2026-10-08T17:26:27.457Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-95108","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.","status":"published","published":"2026-10-08T17:07:03Z","modified":"2026-10-08T17:26:27Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T17:27:28.108203Z"}],"ghsa":[{"id":"GHSA-gcx5-hxj7-gpqq","title":"msgpack5: Quadratic parsing in the streaming decoder","description":"### Impact\n\nThe streaming decoder reparses an incomplete container from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack value across many small chunks, causing quadratic CPU usage and blocking the event loop.\n\n### Patches\n\nThe decoder now preserves incremental container state so completed elements are not parsed again when more input arrives.\n\n### Workarounds\n\nBuffer each complete MessagePack value before decoding it, or limit the number of chunks accepted for a single value.","status":"published","published":"2026-10-08T17:39:46Z","modified":"2026-10-08T17:39:47Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:41:30.097746Z"}],"nvd":[{"id":"CVE-2026-107297","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.","status":"published","published":"2026-10-08T17:17:15.55Z","modified":"2026-10-08T20:48:36.97Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"CVE-2026-107297","title":"msgpack5: Quadratic parsing in the streaming decoder","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.","status":"published","published":"2026-10-08T17:07:03.74Z","modified":"2026-10-28T02:30:30.700604535Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:44:54.933106Z"},{"id":"GHSA-gcx5-hxj7-gpqq","title":"msgpack5: Quadratic parsing in the streaming decoder","description":"### Impact\n\nThe streaming decoder reparses an incomplete container from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack value across many small chunks, causing quadratic CPU usage and blocking the event loop.\n\n### Patches\n\nThe decoder now preserves incremental container state so completed elements are not parsed again when more input arrives.\n\n### Workarounds\n\nBuffer each complete MessagePack value before decoding it, or limit the number of chunks accepted for a single value.","status":"published","published":"2026-10-08T17:39:46Z","modified":"2026-10-08T18:00:08.904462199Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:46:47.822182Z"},{"id":"AZL-106842","title":"CVE-2026-107297 affecting package msgpack 3.3.0-1","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.","status":"published","published":"2026-10-08T17:17:15Z","modified":"2026-10-15T05:37:09Z","updated_at":"2026-11-02T15:28:01.408755Z"},{"id":"CLSA-2026-1791806348","title":"TuxCare security update for msgpack5 (5 CVEs)","description":"TuxCare rebuilt msgpack5 to address 5 CVEs. Fixed in 4.5.1-tuxcare.1.","status":"published","published":"2026-10-12T11:59:08Z","modified":"2026-10-23T13:58:13.881280526Z","updated_at":"2026-11-02T15:43:50.599064Z"},{"id":"CLSA-2026-1793302953","title":"TuxCare security update for msgpack5 (7 CVEs)","description":"TuxCare rebuilt msgpack5 to address 7 CVEs. Fixed in 3.6.1-tuxcare.1.","status":"published","published":"2026-10-29T20:42:34Z","modified":"2026-10-30T02:15:06.130856267Z","updated_at":"2026-11-02T15:43:55.669514Z"}]}}