{"id":"CVE-2026-54399","aliases":["GHSA-hf6x-8p5f-cgmf"],"url":"https://o3.security/vulnerability/CVE-2026-54399","summary":"Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration","details":"Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length","published":"2026-07-01T17:02:21.778Z","modified":"2026-08-13T21:42:03.435408085Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00565,"percentile":0.44228,"asOf":"2026-08-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.httpcomponents.core5:httpcore5","fixedVersion":"5.4.3"},{"ecosystem":"Maven","name":"org.apache.httpcomponents.core5:httpcore5","fixedVersion":"5.5-beta2"}],"fix":null,"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/07/01/4"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54399.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54399"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-13T21:42:03.435408085Z"}}