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This issue is fixed in version 6.1.0.","state":0,"publishedAt":"2026-10-08T17:14:19.514+00:00","modifiedAt":"2026-10-19T19:29:15.139+00:00","affected":[{"ecosystem":"Vendor product","name":"msgpack5","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"mcollina\",\n                    \"product\": \"msgpack5\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.1.0. < 6.1.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph","https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107302","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107302","identifiers":["CVE-2026-107302"]},"retained":false,"historicalAffected":[]},{"revision":"5bf283f4bfaf4cf0a5518a924a7f461a","observedAt":"2026-11-07T04:31:11.176+00:00","statement":{"source":"euvd","id":"EUVD-2026-95114","aliases":["CVE-2026-107302","GHSA-8f34-f56x-9xph"],"title":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefo…","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError, which can unexpectedly terminate a request, stream, or worker in applications that wait for additional bytes after IncompleteBufferError. There is no adjacent-memory disclosure because the buffer implementation checks bounds. This issue is fixed in version 6.1.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph","https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95114","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 8, 2026, 5:14:19 PM","dateUpdated":"Oct 19, 2026, 7:29:15 PM"},"relatedAdvisories":[{"id":"msrc_CVE-2026-107302","title":"msgpack5: Truncated map32 headers throw an unexpected error","vulnerabilityIds":["CVE-2026-107302"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError, which can unexpectedly terminate a request, stream, or worker in applications that wait for additional bytes after IncompleteBufferError. There is no adjacent-memory disclosure because the buffer implementation checks bounds. This issue is fixed in version 6.1.0.","state":0,"publishedAt":"2026-10-08T18:17:19.1+00:00","modifiedAt":"2026-10-19T20:17:47.077+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107302","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-125"],"productCriteria":[],"sourceDates":{"published":"2026-10-08T18:17:19.100","lastModified":"2026-10-19T20:17:47.077"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-107302","identifiers":["CVE-2026-107302"]},"retained":false,"historicalAffected":[]},{"revision":"b91664ff229841fbb873919c118f22bc","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-8f34-f56x-9xph","aliases":["CVE-2026-107302"],"title":"msgpack5: Truncated map32 headers throw an unexpected error","description":"### Impact\n\nA truncated `map32` header causes an out-of-bounds buffer read and throws `RangeError` instead of `IncompleteBufferError`. Applications that rely on `IncompleteBufferError` to wait for additional bytes may terminate a request, stream, or worker unexpectedly. No adjacent memory is disclosed because the buffer implementation checks bounds.\n\n### Patches\n\nThe decoder now validates the complete five-byte `map32` header before reading its length and reports truncated input as `IncompleteBufferError`.\n\n### Workarounds\n\nRequire at least five bytes before decoding a value beginning with `0xdf`, or catch `RangeError` and treat it as incomplete input only for truncated `map32` headers.","state":0,"publishedAt":"2026-10-08T17:40:10+00:00","modifiedAt":"2026-10-19T19:45:04.4080715+00:00","affected":[{"ecosystem":"npm","name":"msgpack5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.1.0"},{"kind":"fixed","version":"6.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph","https://nvd.nist.gov/vuln/detail/CVE-2026-107302","https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1","https://github.com/mcollina/msgpack5","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://github.com/advisories/GHSA-8f34-f56x-9xph","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8f34-f56x-9xph","identifiers":["GHSA-8f34-f56x-9xph","CVE-2026-107302"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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