CVE-2026-3288
A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/rewrite-target` Ingress annotation can be used to inject configuration into nginx.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.55%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/rewrite-target` Ingress annotation can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 6.55% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- kubernetes/ingress-nginx
- Source
- jordan@liggitt.net
EPSS moved from 0.7% on 24 September 2026 to 6.5% on 26 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- https://github.com/kubernetes/kubernetes/issues/137560Issue Tracking, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/09/8Mailing List, Third Party Advisory
- https://github.com/bvabhishek/CVE-2026-3288-labMitigation, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.