{"schema_version": "1.6.1", "id": "CVE-2026-54399", "summary": "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", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "5.5-alpha"}, {"last_affected": "5.5-alpha"}]}, {"type": "SEMVER", "events": [{"introduced": "5.0-alpha"}, {"last_affected": "5.0-alpha"}]}]}], "references": [{"type": "WEB", "url": "https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy"}]}