# CVE-2026-57284: Jenkins Pipeline: Groovy Plugin vulnerable to unrestricted instantiation of types

> Attackers can instantiate arbitrary types via the Pipeline Snippet Generator, potentially leading to code execution or privilege escalation in Jenkins.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-2w2h-gwwj-fh3q

## What is CVE-2026-57284?

CVE-2026-57284 is a medium-severity code injection vulnerability in Jenkins Pipeline: Groovy Plugin, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Jenkins Pipeline: Groovy Plugin 4331.v9d06ed4658ff and earlier does not restrict the types that can be instantiated through the Pipeline Snippet Generator, allowing attackers to instantiate types related to job or system configuration other than Pipeline steps.

Weakness: CWE-470 (Use of Externally-Controlled Input to Select Classes or Code)

## Which versions are affected by CVE-2026-57284?

2 open source packages ship an affected version, including io.jenkins.plugins:pipeline-groovy-lib. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `io.jenkins.plugins:pipeline-groovy-lib` | Maven | All versions | 4331.4333 |
| `io.jenkins.plugins:pipeline-groovy-lib` | Maven | All versions | 4331.4333 |

Products: Jenkins Pipeline\.

## How do I fix CVE-2026-57284?

Upgrade io.jenkins.plugins:pipeline-groovy-lib to 4331.4333 or later.

## Is CVE-2026-57284 being exploited?

There is no known exploitation of CVE-2026-57284 in the wild and no public exploit code.

## Other vulnerabilities in Jenkins Pipeline: Groovy Plugin

- [CVE-2019-1003030](https://insights.sbomify.com/CVE-2019-1003030/): Jenkins Matrix Project Plugin Remote Code Execution (critical 9.9, exploited in the wild)
- [CVE-2022-43402](https://insights.sbomify.com/CVE-2022-43402/): Jenkins Pipeline: Groovy Plugin allows sandbox protection bypass and arbitrary code execution (critical 9.9)
- [CVE-2019-1003041](https://insights.sbomify.com/CVE-2019-1003041/): Sandbox bypass vulnerability in Jenkins Pipeline: Groovy Plugin (critical 9.8)
- [CVE-2022-43407](https://insights.sbomify.com/CVE-2022-43407/): CSRF protection for any URL can be bypassed in Jenkins Pipeline: Input Step Plugin (high 8.8)
- [CVE-2022-25173](https://insights.sbomify.com/CVE-2022-25173/): Improper Neutralization of Special Elements used in an OS Command in Jenkins Pipeline: Groovy Plugin (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57284 and fix it if it is affected.

What it is: CVE-2026-57284 is a medium-severity code injection vulnerability in Jenkins Pipeline: Groovy Plugin, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-57284 in the wild and no public exploit code.

Affected packages and fixed versions:
- io.jenkins.plugins:pipeline-groovy-lib (Maven): affected all versions; fixed in 4331.4333
- io.jenkins.plugins:pipeline-groovy-lib (Maven): affected all versions; fixed in 4331.4333

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-2026-57284/ (Markdown: https://insights.sbomify.com/CVE-2026-57284/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57284
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57284
- OSV: https://osv.dev/vulnerability/CVE-2026-57284

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57284/
Summaries are generated and may contain mistakes; the official description above is the record.