{"id":"CVE-2026-32284","sourceIdentifier":"security@golang.org","published":"2026-03-26T20:16:12.087","lastModified":"2026-10-07T18:17:20.127","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"El decodificador msgpack no valida correctamente la longitud del búfer de entrada al procesar datos fixext truncados (códigos de formato 0xd4-0xd8). Esto puede provocar una lectura fuera de límites y un pánico en tiempo de ejecución, lo que permite un ataque de denegación de servicio."}],"affected":[{"source":"security@golang.org","affectedData":[{"vendor":"github.com/shamaton/msgpack","product":"github.com/shamaton/msgpack","defaultStatus":"affected","collectionURL":"https://pkg.go.dev","packageName":"github.com/shamaton/msgpack","programRoutines":[{"name":"Unmarshal"},{"name":"UnmarshalAsMap"},{"name":"UnmarshalAsArray"},{"name":"DecodeStructAsArray"},{"name":"DecodeStructAsMap"}]},{"vendor":"github.com/shamaton/msgpack/v2","product":"github.com/shamaton/msgpack/v2","defaultStatus":"unaffected","collectionURL":"https://pkg.go.dev","packageName":"github.com/shamaton/msgpack/v2","programRoutines":[{"name":"Unmarshal"},{"name":"UnmarshalAsMap"},{"name":"UnmarshalAsArray"}],"versions":[{"version":"0","lessThan":"2.4.1","versionType":"semver","status":"affected"}]},{"vendor":"github.com/shamaton/msgpack/v3","product":"github.com/shamaton/msgpack/v3","defaultStatus":"unaffected","collectionURL":"https://pkg.go.dev","packageName":"github.com/shamaton/msgpack/v3","programRoutines":[{"name":"Unmarshal"},{"name":"UnmarshalAsMap"},{"name":"UnmarshalAsArray"}],"versions":[{"version":"0","lessThan":"3.1.1","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-03-30T14:04:12.686407Z","id":"CVE-2026-32284","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-125"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:shamaton:msgpack:*:*:*:*:*:go:*:*","versionEndIncluding":"3.1.2","matchCriteriaId":"E3EFFC2E-A452-4815-B2AC-3AD7CD6828D3"}]}]}],"references":[{"url":"https://github.com/golang/vulndb/issues/4513","source":"security@golang.org","tags":["Issue Tracking","Third Party Advisory"]},{"url":"https://github.com/shamaton/msgpack/issues/59","source":"security@golang.org","tags":["Issue Tracking","Vendor Advisory"]},{"url":"https://pkg.go.dev/vuln/GO-2026-4513","source":"security@golang.org","tags":["Third Party Advisory"]},{"url":"https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Third Party Advisory"]}]}