# CVE-2026-73489

## Summary

- **CVE ID:** CVE-2026-73489
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** CWE-129
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 17, 2026

## Description

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 (< 0.62.4)

## References

- [CNA](https://github.com/Eugeny/russh/security/advisories/GHSA-cqjc-rmpq-xprq)
- [CNA](https://github.com/Eugeny/russh/commit/8912512371820167a12a0a638bd666856ce458ad)
- [CNA](https://github.com/Eugeny/russh/releases/tag/v0.62.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._