{"id":"GHSA-5x5g-h9x8-2fh9","summary":"msgpack5: Many buffered values can exhaust the streaming decoder stack","details":"### Impact\n\nThe streaming decoder recursively invokes itself for every complete value remaining in a chunk. A single chunk containing many small valid MessagePack values can exhaust the JavaScript call stack and interrupt the process or stream.\n\n### Patches\n\nThe streaming decoder now drains concatenated values iteratively with constant call-stack depth.\n\n### Workarounds\n\nLimit the number of MessagePack values accepted in one chunk, or split large batches before passing them to the decoder stream.","aliases":["CVE-2026-107300"],"modified":"2026-10-08T18:00:08.893076738Z","published":"2026-10-08T17:40:06Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-10-08T17:40:06Z","nvd_published_at":null,"cwe_ids":["CWE-674"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-5x5g-h9x8-2fh9"},{"type":"WEB","url":"https://github.com/mcollina/msgpack5/commit/77fbef144d05def5d16fc22c37caa64c0a7efeba"},{"type":"PACKAGE","url":"https://github.com/mcollina/msgpack5"},{"type":"WEB","url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"}],"affected":[{"package":{"name":"msgpack5","ecosystem":"npm","purl":"pkg:npm/msgpack5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-5x5g-h9x8-2fh9/GHSA-5x5g-h9x8-2fh9.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}