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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-cc8m-98fm-rc9g Skipper is vulnerable to arbitrary code execution through lua filters
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 16 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 16 Jan 2026 20:15:00 +0000

Type Values Removed Values Added
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.
Title Skipper arbitrary code execution through lua filters
Weaknesses CWE-250
CWE-522
CWE-94
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-16T20:24:12.702Z

Reserved: 2026-01-15T15:45:01.958Z

Link: CVE-2026-23742

cve-icon Vulnrichment

Updated: 2026-01-16T20:23:49.789Z

cve-icon NVD

Status : Received

Published: 2026-01-16T20:15:51.613

Modified: 2026-01-16T20:15:51.613

Link: CVE-2026-23742

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses