CVE-2024-43410 Russh has an OOM Denial of Service due to allocation of untrusted amount

What is CVE-2024-43410?

CVE-2024-43410 is a high-severity denial of service vulnerability in Eugeny russh, published on 21 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Russh is a Rust SSH client & server library. Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server. An SSH packet consists of a 4-byte big-endian length, followed by a byte stream of this length. After parsing and potentially decrypting the 4-byte length, russh allocates enough memory for this bytestream, as a performance optimization to avoid reallocations later. But this length is entirely untrusted and can be set to any value by the client, causing this much memory to be allocated, which will cause the process to OOM within a few such requests. This vulnerability is fixed in 0.44.1.

Weakness: CWE-770

Which versions are affected by CVE-2024-43410?

2 open source packages ship an affected version, including russh. It affects 2 products.

Products include Russh Project Russh, Warpgate Project Warpgate.

How do I fix CVE-2024-43410?

Upgrade russh to 0.44.1 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-43410 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-43410 exists.

Other vulnerabilities in Eugeny russh

• CVE-2026-42189 Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth High 7.5
• CVE-2025-54804 Russh is missing an overflow check during channel windows adjust Medium 6.5
• CVE-2023-28113 russh may use insecure Diffie-Hellman keys Medium 5.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vgvv-x7xg-6cqg.