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8.3
Keycloak can be tricked to run unwanted code
published 5 days ago
Summary
The Keycloak product, which uses the Netty networking library, contains a flaw that lets an attacker send specially crafted data and cause the server to execute code they choose. This could let a malicious user take control of the affected system. Update Keycloak to the latest version or apply the vendor's security patch to resolve the issue.
What to do
- Update cleanstart keycloak to version 26.4.13-r1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | keycloak |
< 26.4.13-r1 Fix: upgrade to 26.4.13-r1
|
Original advisory text
Netty is a network application framework for development of protocol servers and clients
Security vulnerability affects the keycloak package. Netty is a network application framework for development of protocol servers and clients.
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically (estimated)
- Gives an attacker partial control (estimated)
Timeline
Published30 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2026-PS30727 · OSV
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