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

Source: https://junglewise.ai/threats/cve-2026-23742-skipper-is-vulnerable-to-arbitrary-code-execution-through-lua  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-03  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/github-com-zalando-skipper). Vendors: [Go](https://junglewise.ai/threats/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

  ```sh
  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

## Related threats

- [Skipper OPA body-authz bypass in chunked/HTTP-2 requests](https://junglewise.ai/threats/cve-2026-86043-skipper-opa-body-authz-bypass-in-chunked-http-2-requests)
- [Zalando Skipper OPA request body authorization bypass](https://junglewise.ai/threats/cve-2026-65838-zalando-skipper-opa-request-body-authorization-bypass)
- [Zalando Skipper memory exhaustion DoS in admission webhook](https://junglewise.ai/threats/cve-2026-54247-zalando-skipper-memory-exhaustion-dos-in-admission-webhook)
- [Zalando Skipper missing authentication in routesrv API endpoints](https://junglewise.ai/threats/cve-2026-54246-zalando-skipper-missing-authentication-in-routesrv-api-endpoints)
- [Zalando Skipper OPA authorization bypass via HTTP request smuggling](https://junglewise.ai/threats/cve-2026-50197-zalando-skipper-opa-authorization-bypass-via-http-request)