# CVE-2021-40146: A Remote Code Execution (RCE) vulnerability exists in Apache Any23 YAMLExtractor.java

> A remote code execution vulnerability in Apache Any23 allows attackers to execute arbitrary code via malicious YAML input.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 11 Sep 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-99px-7724-484v

## What is CVE-2021-40146?

CVE-2021-40146 is a critical unsafe deserialization vulnerability in Apache Any23, published on 11 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Remote Code Execution (RCE) vulnerability was discovered in the Any23 YAMLExtractor.java file and is known to affect Any23 versions < 2.5. RCE vulnerabilities allow a malicious actor to execute any code of their choice on a remote machine over LAN, WAN, or internet. RCE belongs to the broader class of arbitrary code execution (ACE) vulnerabilities.

## Which versions are affected by CVE-2021-40146?

2 open source packages ship an affected version, including org.apache.any23:apache-any23. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.any23:apache-any23` | Maven | All versions | 2.5 |
| `org.apache.any23:apache-any23` | Maven | All versions | 2.5 |

Products: Apache Any23.

## How do I fix CVE-2021-40146?

Upgrade org.apache.any23:apache-any23 to 2.5 or later.

## Is CVE-2021-40146 being exploited?

There is no known exploitation of CVE-2021-40146 in the wild and no public exploit code.

## Other vulnerabilities in Apache Any23

- [CVE-2022-25312](https://insights.sbomify.com/CVE-2022-25312/): An XML external entity (XXE) injection vulnerability exists in the Apache Any23 RDFa XSLTStylesheet extractor (critical 9.1)
- [CVE-2021-38555](https://insights.sbomify.com/CVE-2021-38555/): An XML external entity (XXE) injection vulnerability exists in Apache Any23 StreamUtils.java (critical 9.1)
- [CVE-2023-34150](https://insights.sbomify.com/CVE-2023-34150/): Apache Any23: Possible excessive allocation of resources reading input. (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40146 and fix it if it is affected.

What it is: CVE-2021-40146 is a critical unsafe deserialization vulnerability in Apache Any23, published on 11 Sep 2021. 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-2021-40146 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.any23:apache-any23 (Maven): affected all versions; fixed in 2.5
- org.apache.any23:apache-any23 (Maven): affected all versions; fixed in 2.5

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-2021-40146/ (Markdown: https://insights.sbomify.com/CVE-2021-40146/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40146
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40146
- OSV: https://osv.dev/vulnerability/CVE-2021-40146

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-40146/
Summaries are generated and may contain mistakes; the official description above is the record.