# CVE-2020-35891: Double free in ordnung

> A double free vulnerability in the ordnung Rust crate allows attackers to cause memory corruption, potentially leading to code execution or crashes.

- **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:** No
- **Published:** 31 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-4wj3-p7hj-cvx8

## What is CVE-2020-35891?

CVE-2020-35891 is a high-severity use after free vulnerability in n/a, published on 31 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in the ordnung crate through 2020-09-03 for Rust. compact::Vec violates memory safety via a remove() double free.

Weakness: CWE-415 (Double Free)

## Which versions are affected by CVE-2020-35891?

2 open source packages ship an affected version, including ordnung. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ordnung` | crates.io | All versions to 0.0.1 | None |
| `ordnung` | crates.io | All versions to 0.0.1 | None |

Products: Ordnung Project Ordnung.

## How do I fix CVE-2020-35891?

No fix has been published for CVE-2020-35891 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35891 being exploited?

There is no known exploitation of CVE-2020-35891 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-35890](https://insights.sbomify.com/CVE-2020-35890/): Out of bounds read in ordnung (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35891 and fix it if it is affected.

What it is: CVE-2020-35891 is a high-severity use after free vulnerability in n/a, published on 31 Dec 2020. 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-2020-35891 in the wild and no public exploit code.

Affected packages and fixed versions:
- ordnung (crates.io): affected all versions up to 0.0.1; no fix listed
- ordnung (crates.io): affected all versions up to 0.0.1; no fix listed

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-2020-35891/ (Markdown: https://insights.sbomify.com/CVE-2020-35891/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35891
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35891
- OSV: https://osv.dev/vulnerability/CVE-2020-35891

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35891/
Summaries are generated and may contain mistakes; the official description above is the record.