CVE-2026-46729

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{"affected_release": [{"advisory": "RHSA-2026:74858", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "httpd-main-2.4.69-1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-02T00:00:00Z"}], "bugzilla": {"description": "httpd: httpd: mod_heartmonitor: Denial of Service via NULL pointer dereference", "id": "2544835", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544835"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-476", "details": ["A flaw was found in the mod_heartmonitor module of the Apache HTTP Server. A remote, unauthenticated attacker can exploit a NULL pointer dereference vulnerability when the module is configured with a unicast listener. By sending specially crafted network traffic to the listening service, an attacker can crash the server process, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Disable the mod_heartmonitor module or restrict network access to the monitoring port:\n1. Disable the module:\nComment out the LoadModule directive for mod_heartmonitor in the Apache configuration (typically located in `/etc/httpd/conf.modules.d/00-base.conf` or a custom configuration file):\n# LoadModule heartmonitor_module modules/mod_heartmonitor.so\nThen reload the web server configuration:\nsystemctl reload httpd\n2. Restrict network reachability:\nIf mod_heartmonitor is required, configure firewall rules using firewalld to permit traffic to the HeartbeatListen unicast port only from authorized backend nodes:\nfirewall-cmd --permanent --zone=trusted --add-source=<TRUSTED_IP_RANGE>\nfirewall-cmd --reload\nCaveat: Disabling mod_heartmonitor prevents mod_lbmethod_heartbeat from receiving backend node status, which disables heartbeat-based dynamic load balancing.\nWarning: Modifying Apache configuration files requires reloading or restarting httpd, which may briefly interrupt active network connections."}, "name": "CVE-2026-46729", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "httpd:2.4/httpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-10-01T15:55:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46729\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46729\nhttp://www.openwall.com/lists/oss-security/2026/10/01/13\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "threat_severity": "Important"}

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