{"schema":"threatline.record/2","record":{"id":"CVE-2026-107300","aliases":["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.","categories":["Libraries & packages"],"product":"msgpack5","vendor":"mcollina","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-5x5g-h9x8-2fh9","source_modified_at":"2026-10-08T17:40:07Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"msgpack5"},"range":"< 6.1.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107300","source_modified_at":"2026-10-08T17:52:48.010Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"msgpack5","vendor":"mcollina","versions":[{"version":"< 6.1.0","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-5x5g-h9x8-2fh9","source_modified_at":"2026-10-08T18:00:08.893076738Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"msgpack5","purl":"pkg:npm/msgpack5"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"6.1.0"}],"type":"SEMVER"}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-5x5g-h9x8-2fh9","source_modified_at":"2026-10-08T17:40:07Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"msgpack5"},"version":"6.1.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-5x5g-h9x8-2fh9","source_modified_at":"2026-10-08T18:00:08.893076738Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"msgpack5","purl":"pkg:npm/msgpack5"},"version":"6.1.0"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00426,"percentile":0.35846,"score_date":"2026-10-23"},"published_at":"2026-10-08T17:11:13.552Z","modified_at":"2026-10-08T18:00:08.893076738Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-5x5g-h9x8-2fh9","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-08T17:40:07Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-107300","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-08T17:52:48.010Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-5x5g-h9x8-2fh9","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-08T18:00:08.893076738Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-107300","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-5x5g-h9x8-2fh9","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/mcollina/msgpack5/commit/77fbef144d05def5d16fc22c37caa64c0a7efeba","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-5x5g-h9x8-2fh9","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-08T17:52:32.790652Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-08T18:00:08.893076738Z","content_hash":"9ce2c888c49b0f8243d9b227b94b87a0caf363b89671eca69ca167a09a4b4cb3"}}