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CVE-2026-73489— Russh: Post-auth remote panic via pty-req with more than 130 terminal-mode records

Quick assessment

Affected
Eugeny russh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Eugene Russh是Eugene个人开发者的一个SSH协议实现库。 Eugene Russh 0.62.4之前版本存在输入验证错误漏洞，该漏洞源于解析pty-req通道请求时，终端模式记录超过130个，导致越界切片并触发panic，可能造成拒绝服务。

CVSS 4.3 · Medium EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eugeny russh < 0.62.4 affected
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I. Basic Information for CVE-2026-73489

Vulnerability Information
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Vulnerability Title
Russh: Post-auth remote panic via pty-req with more than 130 terminal-mode records
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Eugene Russh 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eugene Russh是Eugene个人开发者的一个SSH协议实现库。 Eugene Russh 0.62.4之前版本存在输入验证错误漏洞，该漏洞源于解析pty-req通道请求时，终端模式记录超过130个，导致越界切片并触发panic，可能造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eugeny russh < 0.62.4 -

II. Public POCs for CVE-2026-73489

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III. Intelligence Information for CVE-2026-73489

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Patches & Fixes for CVE-2026-73489 (1)

Vendor Advisories for CVE-2026-73489 (1)

Vendor Pages for CVE-2026-73489 (1)

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-129

V. Comments for CVE-2026-73489

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