{"id":"CVE-2026-90473","title":"msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts","summary":"msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wrap…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-190"],"vendor":"msgpack","product":"msgpack-java","affected":["msgpack-java <= 0.9.12"],"published":"2026-09-12","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:17:47.370","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90473","references":[{"url":"https://github.com/msgpack/msgpack-java","label":"disclosure@vulncheck.com"},{"url":"https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L573-L581","label":"disclosure@vulncheck.com"},{"url":"https://github.com/msgpack/msgpack-java/issues/1014","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map32","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.0024,"epssPercentile":0.15438,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-21T16:04:17.294461Z"},"ingestedAt":"2026-09-14T15:23:07.480Z","slug":"CVE-2026-90473","body":"## Overview\n\nmsgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}