Denial of Service via NULL pointer dereference in NegoEx mechanism
Summary
Denial of Service via NULL pointer dereference in NegoEx mechanism. Red Hat rates this moderate (CVSS 5.9). Weakness: CWE-476. Affected package(s): krb5-main, insights-proxy/insights-proxy-container-rhel9:1780420428, rhui5/haproxy-rhel9:1779798164, krb5, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:12220 — update the affected packages (`sudo dnf update`).
- krb5-main-1.22.2-7.hum1
- insights-proxy/insights-proxy-container-rhel9:1780420428
- rhui5/haproxy-rhel9:1779798164
- krb5-0:1.21.1-10.el9_8
- krb5-0:1.18.2-34.el8_10
- discovery/discovery-ui-rhel9:1782166952
- discovery/discovery-server-rhel9:1782159791
- rhui5/rhua-rhel9:1779798222
- krb5-0:1.21.3-10.el10_2
- rhui5/cds-rhel9:1779798159
- rhui5/installer-rhel9:1779798165
Official advisory · high-confidence parse· fetched 5 hours ago·verify at source
- RHSA-2026:12220
Official advisory · high-confidence parse· fetched 5 hours ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:12220 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 5 hours ago·verify at source
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