{"id":"CVE-2026-32284","title":"The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8)","summary":"The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.","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":"shamaton","product":"msgpack","affected":["msgpack <= 3.1.2"],"published":"2026-03-26","updated":"2026-10-07","sourceUpdated":"2026-10-07T18:17:20.127","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-32284","references":[{"url":"https://github.com/golang/vulndb/issues/4513","label":"security@golang.org"},{"url":"https://github.com/shamaton/msgpack/issues/59","label":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2026-4513","label":"security@golang.org"},{"url":"https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32284"},{"url":"https://github.com/shamaton/msgpack"}],"tags":["nvd","cve.org","exploit-available","osv","go"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-30T14:04:12.686407Z"},"epss":0.00421,"epssPercentile":0.36222,"ingestedAt":"2026-10-07T18:42:20.879Z","aliases":["GHSA-h9q6-hc68-35rp","GO-2026-4513"],"ecosystem":"go","patched":["github.com/shamaton/msgpack/v2 2.4.1","github.com/shamaton/msgpack/v3 3.1.1"],"slug":"CVE-2026-32284","body":"## Overview\n\nThe msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.\n\n## Affected\n\n- `msgpack <= 3.1.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-32284)\n\nAffected packages:\n\n- `github.com/shamaton/msgpack/v2 <= 2.4.0`\n- `github.com/shamaton/msgpack/v3 <= 3.1.0`\n\nPatched in:\n\n- `github.com/shamaton/msgpack/v2 2.4.1`\n- `github.com/shamaton/msgpack/v3 3.1.1`\n\nSource: https://osv.dev/vulnerability/GHSA-h9q6-hc68-35rp","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}