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Vulnerability record · CVE-2026-23742 · published 16 January 2026

CVE-2026-23742: Zalando skipper code injection vulnerability

Zalando · 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. This vulnerability is fixed in 0.23.0.

8.8 CVSS 3.1 High EPSS 0.52% · top 58.0% CWE-94 · Code injectionCWE-250 · Execution with unnecessary privileges
8.8CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/zalando/skipper/commit/0b52894570773b29e2f3c571b94b4211ef8fa714 Patch
https://github.com/zalando/skipper/releases/tag/v0.23.0 ProductRelease Notes
https://github.com/zalando/skipper/security/advisories/GHSA-cc8m-98fm-rc9g ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-23742), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.