CVE-2026-73489: Eugeny Russh

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry [(Pty::TTY_OP_END, 0); 130] array but continues increasing the mode count, then constructs an out-of-bounds slice and panics before the application pty_request handler runs. The panic terminates the server session task without causing memory corruption. This issue is fixed in version 0.62.4.

Affected products

• Eugeny Russh: before 0.62.4 (fixed in 0.62.4)

Published 2026-08-13. Last modified 2026-09-18.