CVE-2026-23742: Skipper is an HTTP router and reverse proxy for service composition

Q: How do I fix CVE-2026-23742?

skipper: upgrade to 0.23.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-23742 being exploited?

CVE-2026-23742 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-23742 affect?

CVE-2026-23742 affects skipper. Severity is high (CVSS 8.8). 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

Q: How urgent is CVE-2026-23742?

Priority 47/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-23742 is a high-severity flaw (CVSS 8.8) affecting skipper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 acces

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-94, CWE-250, CWE-522
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: zalando

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-16 20:15 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

zalando skipper UPGRADE

Affected: < 0.23.0

Fixed in: 0.23.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy skipper || rpm -q skipper || skipper --version

2. UPGRADE to 0.23.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade skipper

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade skipper

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23742?

skipper: upgrade to 0.23.0. Exact commands for each OS are on this page.

Is CVE-2026-23742 being exploited?

CVE-2026-23742 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23742 affect?

CVE-2026-23742 affects skipper. Severity is high (CVSS 8.8). 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

How urgent is CVE-2026-23742?

Priority 47/100. High severity; Public exploit reference

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2026-24470 HIGH 8.1 UPGRADE Skipper is an HTTP router and reverse proxy for service composition

References

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