{"id":"CLEANSTART-2026-HD34144","summary":"When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface","details":"CVE-2026-56853 affects multiple packages. When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. See references for individual vulnerability details.","modified":"2026-10-31T01:02:27.239759505Z","published":"2026-10-31T00:37:54.985419Z","upstream":["CVE-2026-56853"],"database_specific":{},"references":[{"type":"ADVISORY","url":"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-HD34144.json"},{"type":"WEB","url":"https://osv.dev/vulnerability/CVE-2026-56853"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56853"}],"affected":[{"package":{"name":"external-dns-fips","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/external-dns-fips"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-r4"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-HD34144.json"}},{"package":{"name":"prometheus-node-exporter-fips","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/prometheus-node-exporter-fips"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-r7"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-HD34144.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}