{"id":"UBUNTU-CVE-2026-90473","details":"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 wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.","modified":"2026-09-16T11:44:18Z","published":"2026-09-12T11:16:00Z","upstream":["CVE-2026-90473"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-90473"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-90473"},{"type":"REPORT","url":"https://github.com/msgpack/msgpack-java/issues/1014"},{"type":"REPORT","url":"https://github.com/msgpack/msgpack-java"},{"type":"REPORT","url":"https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L573-L581"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map32"}],"affected":[{"package":{"name":"msgpack-java","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/msgpack-java?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.18-2","0.8.19-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libmsgpack-java","binary_version":"0.8.19-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90473.json"}},{"package":{"name":"msgpack-java","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/msgpack-java?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.22-2","0.9.0-1","0.9.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libmsgpack-java","binary_version":"0.9.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90473.json"}},{"package":{"name":"msgpack-java","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/msgpack-java?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.5-1","0.9.6-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.6-1","binary_name":"libmsgpack-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90473.json"}},{"package":{"name":"msgpack-java","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/msgpack-java?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.6-1","0.9.6-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libmsgpack-java","binary_version":"0.9.6-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90473.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}