CVE-2026-23742

Skipper arbitrary code execution through lua filters

State: Published
Severity: 8.8 High
Published: Jan 16, 2026
Updated: Jan 16, 2026
Reserved: Jan 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-250 Execution with Unnecessary Privileges
CWE-522 Insufficiently Protected Credentials

Affected Products

Product	Versions
skipperzalando	< 0.23.0Affected

References

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