CVE-2026-46673 Russh: Unchecked CryptoVec allocation and growth handling is reachable
Attackers can cause denial of service via unchecked integer arithmetic in buffer allocation, affecting local agents or remote traffic in older versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46673?
CVE-2026-46673 is a high-severity vulnerability in Eugeny russh, published on 10 Jun 2026. 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. Prior to version 0.60.3, CryptoVec used unchecked capacity growth, unchecked length arithmetic, and unsafe allocation/locking paths. In current russh releases, local SSH agent peers could still feed attacker-controlled frame lengths into buffer growth before validation. In older russh releases before 0.58.0, remote SSH traffic also reached CryptoVec through transport and compression buffers. This issue has been patched in version 0.60.3.
Weakness: CWE-770
Which versions are affected by CVE-2026-46673?
6 open source packages ship an affected version, including russh and russh-cryptovec.
| Package | Affected | Fixed in |
|---|---|---|
russh crates.io | All versions | 0.60.3 |
russh crates.io | All versions | 0.60.3 |
russh crates.io | From 0.0.0-0 | 0.60.3 |
russh-cryptovec crates.io | All versions | 0.60.3 |
russh-cryptovec crates.io | All versions | 0.60.3 |
russh-cryptovec crates.io | From 0.0.0-0 | 0.60.3 |
How do I fix CVE-2026-46673?
Upgrade russh to 0.60.3 or later.
Is CVE-2026-46673 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46673 exists.
Sources
Also known as DEBIAN-CVE-2026-46673, GHSA-g9f8-wqj9-fjw5, RUSTSEC-2026-0153, RUSTSEC-2026-0154.