CVE-2026-78427 Admission Control Bypass via Hardcoded Sidecar Image Exemption
Attackers can bypass admission control policies by naming container images to match hardcoded sidecar exemptions, evading security checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78427?
CVE-2026-78427 is a medium-severity authentication bypass vulnerability in SUSE github.com/neuvector/neuvector, published on 17 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The NeuVector admission webhook silently excludes containers from policy evaluation when their image path matches one of three hardcoded service mesh sidecar images. Since the image path is entirely controlled by the workload author, any user capable of deploying workloads can evade admission deny rules simply by naming their image path after one of these sidecar images.
Weakness: CWE-807
Which versions are affected by CVE-2026-78427?
How do I fix CVE-2026-78427?
No fix has been published for CVE-2026-78427 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-78427 being exploited?
There is no known exploitation of CVE-2026-78427 in the wild and no public exploit code.
Sources
Also known as GHSA-78r4-3wfq-r2xm.