{"id":"AZL-107796","summary":"CVE-2026-78663 affecting package packer 1.9.5-21","details":"The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.","modified":"2026-10-13T05:35:23Z","published":"2026-10-08T23:17:03Z","upstream":["CVE-2026-78663"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78663"}],"affected":[{"package":{"name":"packer","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/packer"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.9.5-21"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-107796.json"}}],"schema_version":"1.9.0"}