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This can be triggered by sending messages with an excessive number of headers or excessive header length."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, configure an upstream proxy or web application firewall (WAF) to enforce limits on the number and length of HTTP headers. This prevents malformed requests from reaching and exhausting the vulnerable Apache HttpComponents Core component. Consult your proxy or WAF documentation for specific configuration. 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"product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Under investigation", "package_name": "devspaces/openvsx-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Under investigation", "package_name": "devspaces/pluginregistry-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Under investigation", "package_name": "devspaces/server-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "candlepin", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "openvox-server", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "puppetserver", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite-capsule:el8/puppetserver", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Under investigation", "package_name": "satellite:el8/candlepin", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "package_name": "httpcore", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Affected", "package_name": "httpcore", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Affected", "package_name": "httpcore", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-07-01T17:02:21Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54399\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54399\nhttp://www.openwall.com/lists/oss-security/2026/07/01/4\nhttps://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy"], "statement": "Important: This flaw in Apache HttpComponents Core allows a remote attacker to cause a denial of service by sending HTTP/1.1 messages with an excessive number or length of headers. This can lead to memory exhaustion in applications using the affected HTTP/1.1 message parser, impacting service availability.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[5.5-alpha,5.5-beta1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[5.0-alpha,5.4.2]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}]}, "product": "httpcomponents_core", "vendor": "apache"}], "created": "2026-07-02T08:00:04.745696+00:00", "updated": "2026-08-12T09:45:01.480891+00:00", "vendors": ["apache", "apache$PRODUCT$httpcomponents_core"]}