Exploit discussion active in current signal (1 latest mentions)
Recommended action window: High priority (within 72h)
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-09-20 | 1 | PoC1 |
| 2026-09-21 | 1 | Patch1 |
Note: engine 23.01 still carries CVE-2024-11477 for Zstd decompress only — don’t extract untrusted Zstd until we move past 7-Zip 24.07. The fix is coming very shortly. Tracked: https://github.com/borisbrodski/sevenzipjbinding/issues/72
Post summary
The text warns that CVE-2024-11477 remains present in engine 23.01 for Zstd decompression and advises users to avoid extracting untrusted Zstd files until version 24.07 is released.
Crashing 7Zip: Understanding a DoS PoC for CVE-2024-11477 https://ashishranax.com/posts/CVE-2024-11477-PoC/ In this blog I am covering my attempt, thought process, and understanding of CVE-2024-11477. I was able to achieve DoS (not RCE) by modifying 2 bytes in a simple .zstd compressed file #cve202411477
Post summary
PoC for CVE-2024-11477 demonstrating DoS in 7Zip via .zstd byte modification; no active exploitation or patch disclosed.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | 7-zip | 7-zip | - | - | - |