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

CVE-2024-11477 is fixed in 7zip on 1 platform, first by DEBIAN-CVE-2024-11477, released November 22, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-11477
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.2239
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 22, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | 7zip Debian 13.5 (trixie) | 24.07+dfsg-1 | [DEBIAN-CVE-2024-11477](https://patchblox.com/security/data/fix/linux/debian-cve-2024-11477.md) | Nov 22, 2024 |
| Linux | 7zip Debian 14 | 24.07+dfsg-1 | [DEBIAN-CVE-2024-11477](https://patchblox.com/security/data/fix/linux/debian-cve-2024-11477.md) | Nov 22, 2024 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.