CVE-2026-23742Public exploitNetwork attack vector

Authenticated code execution via inline Lua filters

Published Jan 16, 2026 · Updated Jan 16, 2026

Code injection in Zalando Skipper before 0.23.0 allows remote authenticated users to execute Lua as the Skipper process. The startup defaults register the lua() filter with inline and file sources, so attacker-controlled route definitions are compiled and run without a separate Lua opt-in. Access to create routes, such as Kubernetes Ingress resources, is required; scripts can read process-accessible files and expose secrets through readable logs.

CVSS severity8.8
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Zalando Skipper before 0.23.0 allows remote authenticated users to execute Lua as the Skipper process. The startup defaults register the lua() filter with inline and file sources, so attacker-controlled route definitions are compiled and run without a separate Lua opt-in. Access to create routes, such as Kubernetes Ingress resources, is required; scripts can read process-accessible files and expose secrets through readable logs.

The record

CVE
CVE-2026-23742
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
Zalando
Product
Skipper
Classifications
CWE-250, CWE-94, CWE-522, T1059, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zalando · Skipperversion=< 0.23.0

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-250Execution with Unnecessary Privileges
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-522Insufficiently Protected Credentials
T1059Command and Scripting Interpreter
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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