NULL pointer dereference in F5 nginx Ingress Controller
CVE-2026-52865
When NGINX Ingress Controller processes Ingress or TransportServer resources, an authenticated, remote attacker with permission to create or modify Ingress or TransportServer resources can cause the NGINX Ingress Controller process to terminate. Impact: The NGINX Ingress Controller control plane process terminates and enters a persistent crash loop while the malformed Ingress or TransportServer resource remains in the cluster. This vulnerability allows a remote, authenticated attacker with at least Ingress or TransportServer resource write access to cause a denial-of-service (DoS) on the NGINX Ingress Controller system. There is no data plane exposure; this is a control plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- F5 nginx Ingress Controller — versions 5.0.0, 2026-lts-r1
- F5 nginx Ingress Controller
Weakness classification (CWE)
References
- my.f5.com/manage/s/article/K000161834 (vendor-advisory, Mitigation, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-52865?
- CVE-2026-52865 is a medium-severity vulnerability in F5 nginx Ingress Controller, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-07-15.
- How severe is CVE-2026-52865?
- Medium severity. CVSS v3 base score is 6.5 out of 10.