Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zalando | Skipper | < 0.23.0 |
Related Weaknesses (CWE)
References
- https://github.com/zalando/skipper/commit/0b52894570773b29e2f3c571b94b4211ef8fa7Patch
- https://github.com/zalando/skipper/releases/tag/v0.23.0ProductRelease Notes
- https://github.com/zalando/skipper/security/advisories/GHSA-cc8m-98fm-rc9gExploitVendor AdvisoryMitigation
FAQ
What is CVE-2026-23742?
CVE-2026-23742 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2026-23742?
CVE-2026-23742 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23742?
Check the references section above for vendor advisories and patch information. Affected products include: Zalando Skipper.