# CVE-2026-5556: badlogic pi-mono loader.ts discoverAndLoadExtensions code injection

> Remote attackers can execute arbitrary code via the discoverAndLoadExtensions function in the pi-mono library.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-jmxv-3q5p-jmjr

## What is CVE-2026-5556?

CVE-2026-5556 is a medium-severity code injection vulnerability in badlogic pi-mono, published on 5 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security vulnerability has been detected in badlogic pi-mono up to 0.58.4. This vulnerability affects the function discoverAndLoadExtensions of the file packages/coding-agent/src/core/extensions/loader.ts. The manipulation leads to code injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-5556?


## How do I fix CVE-2026-5556?

No fix has been published for CVE-2026-5556 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5556 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5556 exists.

Public exploit code:

- https://github.com/George0Papasotiriou/CVE-2026-5556-Kubernetes-Admission-Controller-Bypass-via-Case-Sensitivity (github_poc): https://github.com/George0Papasotiriou/CVE-2026-5556-Kubernetes-Admission-Controller-Bypass-via-Case-Sensitivity

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5556 and fix it if it is affected.

What it is: CVE-2026-5556 is a medium-severity code injection vulnerability in badlogic pi-mono, published on 5 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5556 exists.

Affected product: badlogic pi-mono. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-5556/ (Markdown: https://insights.sbomify.com/CVE-2026-5556/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5556
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5556
- OSV: https://osv.dev/vulnerability/CVE-2026-5556

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5556/
Summaries are generated and may contain mistakes; the official description above is the record.