GHSA-cc8m-98fm-rc9g: github.com/zalando/skipper (CVE-2026-23742)

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

CVSS 8.8 HighEPSS 0.0051 · 44th percentile

Published by the GitHub Advisory Database at 3 Feb 2026, 20:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/zalando/skipper	Go	<0.23.0	0.23.0

Identifiers

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

Weakness (CWE)

CWE-94 · CWE-250 · CWE-522

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Skipper, the github.com/zalando/skipper Go package, is vulnerable to arbitrary code execution through its Lua filters in versions before 0.23.0. The source gives few details about what an attacker needs to exploit it. Upgrade to version 0.23.0 or later.

Written 10 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

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

CISA KEV Not listed.
EPSS 0.0051, the 44th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 3 Feb 2026. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.