CVE-2026-23742: GO-2026-4327 - Skipper is vulnerable to arbitrary code execution through lua filters in github.com/zalando/skipper

CVE-2026-23742 · Severity: low · CVSS 3.1 · Published 2026-02-03

Skipper is vulnerable to arbitrary code execution through lua filters in github.com/zalando/skipper

Technologies: github.com/zalando/skipper (Go). Vendors: Go.

Quick answers

Is CVE-2026-23742 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-23742 being exploited in the wild.
How severe is CVE-2026-23742?
Low severity, with a CVSS score of 3.1, published 3 February 2026.
Which products and versions are affected?
github.com/zalando/skipper (Go) SEMVER:introduced=0,fixed=0.23.0.
Is there a fix for CVE-2026-23742?
Yes. github.com/zalando/skipper (Go): upgrade to 0.23.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-23742?
Check whether you run github.com/zalando/skipper (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/zalando/skipper (Go): upgrade to 0.23.0 or later
    go get github.com/zalando/skipper@v0.23.0

Affected products

  • github.com/zalando/skipper (Go) SEMVER:introduced=0,fixed=0.23.0

Identifiers

  • CVE-2026-23742
  • GHSA-cc8m-98fm-rc9g
  • GO-2026-4327

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