# CVE-2024-11477: 7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability

> Remote attackers can execute arbitrary code via integer underflow in 7-Zip's Zstandard decompression when processing malicious archives.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 22 Nov 2024
- **Updated:** 15 Feb 2025
- **Also known as:** DEBIAN-CVE-2024-11477, GHSA-882h-ff2x-f86q, UBUNTU-CVE-2024-11477

## What is CVE-2024-11477?

CVE-2024-11477 is a high-severity vulnerability in 7-Zip, published on 22 Nov 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the implementation of Zstandard decompression. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-24346.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2024-11477?

It affects 1 product.


Products: 7-Zip 7-Zip.

## How do I fix CVE-2024-11477?

Upgrade to a fixed version.

## Is CVE-2024-11477 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-11477 exists.

Public exploit code:

- CVE-2024-11477 7Zip Code Execution Writeup and Analysis (github_poc): https://github.com/TheN00bBuilder/cve-2024-11477-writeup

## Other vulnerabilities in 7-Zip

- [CVE-2025-0411](https://insights.sbomify.com/CVE-2025-0411/): 7-Zip Mark of the Web Bypass (high 7.0, exploited in the wild)
- [CVE-2008-6536](https://insights.sbomify.com/CVE-2008-6536/): Other in n/a (critical 10.0)
- [CVE-2026-48095](https://insights.sbomify.com/CVE-2026-48095/): GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation (high 8.8)
- [CVE-2018-10172](https://insights.sbomify.com/CVE-2018-10172/): Privilege escalation in n/a (high 8.8)
- [CVE-2016-2335](https://insights.sbomify.com/CVE-2016-2335/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-11477 and fix it if it is affected.

What it is: CVE-2024-11477 is a high-severity vulnerability in 7-Zip, published on 22 Nov 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-11477 exists.

Affected product: 7-Zip. 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-2024-11477/ (Markdown: https://insights.sbomify.com/CVE-2024-11477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-11477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-11477
- OSV: https://osv.dev/vulnerability/CVE-2024-11477

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-11477/
Summaries are generated and may contain mistakes; the official description above is the record.