{"id":"CVE-2026-107299","published":"2026-10-08T17:17:15.850","lastModified":"2026-10-09T16:17:22.147","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder treats the reserved MessagePack byte 0xc1 as incomplete input instead of invalid input. When 0xc1 begins a stream, subsequent data remains buffered while the decoder waits for bytes that cannot make the value valid, allowing a remote peer to exhaust memory. This issue is fixed in version 6.1.0.","cvssScore":5.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-228"],"vendors":[],"products":[],"references":[{"url":"https://github.com/mcollina/msgpack5/commit/85da345bf1acc18ca441741e5cf4aa0ed0d69314","tags":[]},{"url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","tags":[]},{"url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-26wq-p25c-j6fv","tags":[]}],"exploitRefs":[{"url":"https://github.com/mcollina/msgpack5/commit/85da345bf1acc18ca441741e5cf4aa0ed0d69314","tags":[]},{"url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","tags":[]},{"url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-26wq-p25c-j6fv","tags":[]}],"hasPoc":true,"ai":null}