# CVE-2024-24564: Vyper extract32 can ready dirty memory

> Attackers can read dirty memory via the extract32 function in Vyper, potentially exposing sensitive data from smart contracts.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Feb 2024
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-4hwq-4cpm-8vmx, PYSEC-2024-205

## What is CVE-2024-24564?

CVE-2024-24564 is a low-severity vulnerability in vyperlang vyper, published on 26 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability is fixed in 0.4.0.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2024-24564?

3 open source packages ship an affected version, including vyper. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `vyper` | PyPI | All versions | 0.4.0 |
| `vyper` | PyPI | All versions | 0.4.0 |
| `vyper` | PyPI | All versions | 0.4.0 |

Products: Vyperlang Vyper.

## How do I fix CVE-2024-24564?

Upgrade vyper to 0.4.0 or later.

## Is CVE-2024-24564 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-24564 exists.

## Other vulnerabilities in vyperlang vyper

- [CVE-2024-24563](https://insights.sbomify.com/CVE-2024-24563/): Vyper array negative index vulnerability (critical 9.8)
- [CVE-2024-24561](https://insights.sbomify.com/CVE-2024-24561/): Vyper bounds check on built-in `slice()` function can be overflowed (critical 9.8)
- [CVE-2023-39363](https://insights.sbomify.com/CVE-2023-39363/): Vyper incorrectly allocated named re-entrancy locks (critical 9.1)
- [CVE-2022-24845](https://insights.sbomify.com/CVE-2022-24845/): Integer bounds error in Vyper (high 8.8)
- [CVE-2022-29255](https://insights.sbomify.com/CVE-2022-29255/): Multiple evaluation of contract address in call in vyper (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-24564 and fix it if it is affected.

What it is: CVE-2024-24564 is a low-severity vulnerability in vyperlang vyper, published on 26 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-24564 exists.

Affected packages and fixed versions:
- vyper (PyPI): affected all versions; fixed in 0.4.0
- vyper (PyPI): affected all versions; fixed in 0.4.0
- vyper (PyPI): affected all versions; fixed in 0.4.0

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-2024-24564/ (Markdown: https://insights.sbomify.com/CVE-2024-24564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-24564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-24564
- OSV: https://osv.dev/vulnerability/CVE-2024-24564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-24564/
Summaries are generated and may contain mistakes; the official description above is the record.