CVE-2026-23742
High
Description
Skipper is an HTTP router and reverse proxy for service composition. The default skipper configuration before 0.23.0 was -lua-sources=inline,file. The problem starts if untrusted users can create lua filters, because of -lua-sources=inline , for example through a Kubernetes Ingress resource. The configuration inline allows these user to create a script that is able to read the filesystem accessible to the skipper process and if the user has access to read the logs, they an read skipper secrets. This vulnerability is fixed in 0.23.0.
SeverityHigh
CVSS8.8
Exploit probability—
ProductZalando Skipper
PublishedJan 16, 2026
First seenJan 16, 2026
Weakness typeCWE-94Code injectionCWE-250CWE-250CWE-522CWE-522
How to fix
Update
- zalando skipper0.23.0 or later
- github.com/zalando/skipper0.23.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zalando skipper | v < 0.23.0 | 0.23.0 |
| github.com/zalando/skipperGo | v < 0.23.0 | 0.23.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.