{"id":"AZL-113036","summary":"CVE-2026-48515 affecting package python-msgpack 1.2.3-1","details":"MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, MessagePack-CSharp's multi-dimensional array formatters read dimension lengths directly from the payload and allocate T[,], T[,,], or T[,,,] before validating that the dimension product matches the encoded element count. The formatter reads a guarded element array header, but allocation of the target multi-dimensional array happens before the dimensions are checked against that element count. A small payload can therefore declare large dimensions, provide an empty or tiny inner array, and cause a large heap allocation before element data is validated. This vulnerability is fixed in 2.5.301 and 3.1.7.","modified":"2026-11-13T06:04:48Z","published":"2026-06-22T22:16:48Z","upstream":["CVE-2026-48515"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48515"}],"affected":[{"package":{"name":"python-msgpack","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python-msgpack"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.2.3-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-113036.json"}}],"schema_version":"1.9.2"}