Bug#1144400: rust-russh: CVE-2026-73489

Source: rust-russh
Version: 0.57.1-2
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for rust-russh.

CVE-2026-73489[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-73489
    https://www.cve.org/CVERecord?id=CVE-2026-73489
[1] https://github.com/Eugeny/russh/security/advisories/GHSA-cqjc-rmpq-xprq
[2] https://github.com/Eugeny/russh/commit/8912512371820167a12a0a638bd666856ce458ad 

Regards,
Salvatore