{"id":"CVE-2026-54428","summary":"Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK","details":"Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.","modified":"2026-07-26T03:49:07.189025601Z","published":"2026-07-01T17:03:53.938Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54428.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"5.5-alpha"},{"last_affected":"5.5-beta1"},{"introduced":"5.0-alpha"},{"last_affected":"5.4.2"}]}],"cna_assigner":"apache","cwe_ids":["CWE-400","CWE-770"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/07/01/3"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54428.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54428"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpcomponents-core","events":[{"introduced":"2e0dabfb84ad49c76b8932f0bc5d0d85365976de"},{"last_affected":"4ee5b2a75b847f9f82a3bfec4524c2cb4f4fb3a6"},{"introduced":"75f51152de1bc5b05dc5576d07c0bec96a5d9bcc"},{"last_affected":"fe165c869e50356c677b319c4ebf32d656352be3"}],"database_specific":{"extracted_events":[{"introduced":"5.0"},{"last_affected":"5.4.2"},{"introduced":"5.5-alpha1"},{"last_affected":"5.5-alpha1"},{"introduced":"5.5-beta1"},{"last_affected":"5.5-beta1"}],"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:apache:httpcomponents_core:*:*:*:*:*:*:*:*","cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1:*:*:*:*:*:*","cpe:2.3:a:apache:httpcomponents_core:5.5:beta1:*:*:*:*:*:*"]}}],"versions":["5.5-alpha1","5.5-beta1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-54428.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}