High [CVE-2026-46729] Denial of Service via NULL pointer dereference
This high-severity Red Hat Linux advisory covers CVE-2026-46729; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Denial of Service via NULL pointer dereference. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-476. Red Hat lists fixing advisory RHSA-2026:74858 with package httpd-main-2.4.69-1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 3 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: httpd.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
- httpd-main-2.4.69-1.hum1
- RHSA-2026:74858
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- Disable the mod_heartmonitor module or restrict network access to the monitoring port: 1. Disable the module: Comment 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): # LoadModule heartmonitor_module modules/mod_heartmonitor.so Then reload the web server configuration: systemctl reload httpd 2. Restrict network reachability: If mod_heartmonitor is required, configure firewall rules using firewalld to permit traffic to the HeartbeatListen unicast port only from authorized backend nodes: firewall-cmd --permanent --zone=trusted --add-source=<TRUSTED_IP_RANGE> firewall-cmd --reload Caveat: Disabling mod_heartmonitor prevents mod_lbmethod_heartbeat from receiving backend node status, which disables heartbeat-based dynamic load balancing. Warning: Modifying Apache configuration files requires reloading or restarting httpd, which may briefly interrupt active network connections.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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