# CVE-2025-11419: Keycloak: keycloak tls client-initiated renegotiation denial of service

> Unauthenticated attackers can cause denial of service in Keycloak by exhausting CPU resources via repeated TLS client-initiated renegotiation requests.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Dec 2025
- **Updated:** 20 Apr 2026
- **Also known as:** GHSA-q8hq-4h99-fj7x

## What is CVE-2025-11419?

CVE-2025-11419 is a high-severity denial of service vulnerability in Red Hat build of Keycloak 26.0, published on 23 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2025-11419?

6 open source packages ship an affected version, including org.keycloak:keycloak-quarkus-dist.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.keycloak:keycloak-quarkus-dist` | Maven | All versions | 26.0.16 |
| `org.keycloak:keycloak-quarkus-dist` | Maven | All versions | 26.0.16 |
| `org.keycloak:keycloak-quarkus-dist` | Maven | From 26.1.0 | 26.2.10 |
| `org.keycloak:keycloak-quarkus-dist` | Maven | From 26.1.0 | 26.2.10 |
| `org.keycloak:keycloak-quarkus-dist` | Maven | From 26.3.0 | 26.4.1 |
| `org.keycloak:keycloak-quarkus-dist` | Maven | From 26.3.0 | 26.4.1 |

## How do I fix CVE-2025-11419?

Upgrade org.keycloak:keycloak-quarkus-dist to a fixed version for your release line: 26.0.16, 26.2.10 or 26.4.1.

## Is CVE-2025-11419 being exploited?

There is no known exploitation of CVE-2025-11419 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-11419 and fix it if it is affected.

What it is: CVE-2025-11419 is a high-severity denial of service vulnerability in Red Hat build of Keycloak 26.0, published on 23 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-11419 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.keycloak:keycloak-quarkus-dist (Maven): affected all versions; fixed in 26.0.16
- org.keycloak:keycloak-quarkus-dist (Maven): affected all versions; fixed in 26.0.16
- org.keycloak:keycloak-quarkus-dist (Maven): affected from 26.1.0; fixed in 26.2.10
- org.keycloak:keycloak-quarkus-dist (Maven): affected from 26.1.0; fixed in 26.2.10
- org.keycloak:keycloak-quarkus-dist (Maven): affected from 26.3.0; fixed in 26.4.1
- org.keycloak:keycloak-quarkus-dist (Maven): affected from 26.3.0; fixed in 26.4.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-11419/ (Markdown: https://insights.sbomify.com/CVE-2025-11419/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11419
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11419
- OSV: https://osv.dev/vulnerability/CVE-2025-11419

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-11419/
Summaries are generated and may contain mistakes; the official description above is the record.