RCE in Zalando Skipper
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…
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.005 (38.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Zalando Skipper — versions < 0.23.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-23742?
- CVE-2026-23742 is a high-severity vulnerability in Zalando Skipper, classified under Code Injection. CVSS score: 8.8/10. Published 2026-01-16.
- How severe is CVE-2026-23742?
- High severity. CVSS v3 base score is 8.8 out of 10.