{"id":"AZL-113039","summary":"CVE-2026-48516 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, InterfaceLookupFormatter\u003cTKey,TElement\u003e constructs an internal Dictionary\u003cTKey, IGrouping\u003cTKey,TElement\u003e\u003e with the default equality comparer instead of the security-aware comparer supplied by options.Security.GetEqualityComparer\u003cTKey\u003e(). This formatter omission allows hash-collision CPU denial of service against ILookup\u003cTKey,TElement\u003e even when the application has opted into the untrusted-data security posture 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-2026-48516"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48516"}],"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-113039.json"}}],"schema_version":"1.9.2"}