CVE-2026-23742

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.

• CWE-94
• CWE-250
• CWE-522

• https://github.com/zalando/skipper/commit/0b52894570773b29e2f3c571b94b4211ef8fa714Patch
• https://github.com/zalando/skipper/releases/tag/v0.23.0Product, Release Notes
• https://github.com/zalando/skipper/security/advisories/GHSA-cc8m-98fm-rc9gExploit, Mitigation, Vendor Advisory

Published

Jan 16, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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