{"id":"AZL-107772","summary":"CVE-2026-78663 affecting package opa 0.63.0-5","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":"2026-10-12T05:37:42Z","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":"opa","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/opa"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.63.0-5"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-107772.json"}}],"schema_version":"1.9.0"}