{"id":"CVE-2026-107302","title":"msgpack5 is a msgpack v5 implementation for node.js and the browser","summary":"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 ther…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-125"],"vendor":"msgpack5","product":"msgpack5","affected":["msgpack5 < 6.1.0"],"patched":["msgpack5 6.1.0"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T20:48:36.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107302","references":[{"url":"https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1","label":"security-advisories@github.com"},{"url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","label":"security-advisories@github.com"},{"url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-8f34-f56x-9xph"}],"tags":["nvd","ghsa","npm","cve.org"],"aliases":["GHSA-8f34-f56x-9xph"],"ecosystem":"npm","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-08T17:32:15.263797Z"},"ingestedAt":"2026-10-08T17:56:11.724Z","slug":"CVE-2026-107302","body":"## Overview\n\nmsgpack5 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-107302)\n\nAffected packages:\n\n- `msgpack5 < 6.1.0`\n\nPatched in:\n\n- `msgpack5 6.1.0`\n\nSource: https://github.com/advisories/GHSA-8f34-f56x-9xph","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}