Kubernetes
CVE-2026-23742
HIGH
GHSA-cc8m-98fm-rc9g
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Skipper versions before 0.23.0 allow authenticated users with Ingress resource creation privileges to execute arbitrary Lua scripts that read sensitive filesystem data and secrets accessible to the Skipper process. The vulnerability stems from the default -lua-sources=inline configuration enabling untrusted users to create inline Lua filters. Public exploit code exists for this high-severity vulnerability affecting Kubernetes environments running vulnerable Skipper versions.
Technical ContextAI
Classified as CWE-94 (Code Injection). Affects Skipper. 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.
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 0.23.0.. Restrict network access to the affected service where possible.
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View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
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External POC / Exploit Code
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