How severe is CVE-2026-52865?

CVE-2026-52865 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-52865 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-52865?

CVE-2026-52865 affects F5 Nginx Ingress Controller. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-52865?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-52865 published?

CVE-2026-52865 was published on 2026-07-15 and last updated on 2026-07-16.

CVE-2026-52865

CVE-2026-52865 is a medium-severity vulnerability in F5 Nginx Ingress Controller with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: F5 Nginx Ingress Controller
Published: 2026-07-15
Last modified: 2026-07-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-52865?: CVE-2026-52865 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-52865 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-52865?: CVE-2026-52865 affects F5 Nginx Ingress Controller. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-52865?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-52865 published?: CVE-2026-52865 was published on 2026-07-15 and last updated on 2026-07-16.

References

https://my.f5.com/manage/s/article/K000161834

Affected products (1)

cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*

More vulnerabilities in F5 Nginx Ingress Controller

CVE-2026-55723 — High (CVSS 8.3): When NGINX Ingress Controller is configured with Custom Resource Definitions (CRDs) or Ingress annotations, an…
CVE-2025-14727 — High (CVSS 8.3): A vulnerability exists in NGINX Ingress Controller's nginx.org/rewrite-target annotation validation. Note: Software…
CVE-2026-60005 — High (CVSS 8.2): NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice directive…
CVE-2026-42533 — High (CVSS 8.1): A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string…
CVE-2026-42530 — High (CVSS 8.1): NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use…
CVE-2026-42055 — High (CVSS 8.1): NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and…

All CVEs affecting F5 Nginx Ingress Controller →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-67870 — Critical (CVSS 9.8): In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete validation flaw for non-local…
CVE-2026-53399 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on setlease…
CVE-2026-53355 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: net: rds: clear i_sends on setup unwind The RDS…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →