{"id":"AZL-107087","summary":"CVE-2026-78659 affecting package kata-containers-preview 3.27.0~preview2-2","details":"When \"Trailer\" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a \"Trailer\" header that declares a large number of fields, causing the server to allocate a disproportionate amount of memory while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits. This exploit is not applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP connection, and whose Server.MaxHeaderBytes are calculated differently.","modified":"2026-10-12T05:33:09Z","published":"2026-10-08T23:17:03Z","upstream":["CVE-2026-78659"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78659"}],"affected":[{"package":{"name":"kata-containers-preview","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kata-containers-preview"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.27.0~preview2-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-107087.json"}}],"schema_version":"1.9.0"}