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

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 22.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-22 · updated 2026-06-17
Weakness: CWE-191

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.

Affected products

7-Zip: before 24.07 — fixed in 24.07

How to fix

Upgrade to a fixed version: 7-Zip 24.07. Check the vendor advisory for mitigations.

References

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