CVE-2026-73489: CWE-129: Improper Validation of Array Index in Eugeny russh
CVE-2026-73489 is a medium severity vulnerability in the russh Rust SSH client and server library. Versions prior to 0.62.4 allow an authenticated SSH client to cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. This triggers a panic due to an out-of-bounds slice construction in the terminal mode parser, terminating the server session task without memory corruption. The issue is fixed in version 0.62.4.
AI Analysis
Technical Summary
Russh versions before 0.62.4 contain an improper validation of array index (CWE-129) vulnerability in the server-side terminal mode parser. The parser uses a fixed-size array of 130 entries to store terminal modes but does not prevent the mode count from exceeding this limit. When an authenticated SSH client sends a pty-req channel request with more than 130 terminal-mode records, the parser constructs an out-of-bounds slice, causing a panic that terminates the server session task. This denial of service does not lead to memory corruption. The vulnerability is resolved in russh version 0.62.4.
Potential Impact
An authenticated SSH client can cause a denial of service by triggering a panic in the server session task, disrupting service availability. There is no impact on confidentiality or integrity, and no memory corruption occurs.
Mitigation Recommendations
Upgrade russh to version 0.62.4 or later to apply the official fix that prevents the denial of service condition. Patch status is confirmed by the vendor advisory indicating the issue is fixed in 0.62.4.
CVE-2026-73489: CWE-129: Improper Validation of Array Index in Eugeny russh
Description
CVE-2026-73489 is a medium severity vulnerability in the russh Rust SSH client and server library. Versions prior to 0.62.4 allow an authenticated SSH client to cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. This triggers a panic due to an out-of-bounds slice construction in the terminal mode parser, terminating the server session task without memory corruption. The issue is fixed in version 0.62.4.
CVSS v3.1
Score 4.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Russh versions before 0.62.4 contain an improper validation of array index (CWE-129) vulnerability in the server-side terminal mode parser. The parser uses a fixed-size array of 130 entries to store terminal modes but does not prevent the mode count from exceeding this limit. When an authenticated SSH client sends a pty-req channel request with more than 130 terminal-mode records, the parser constructs an out-of-bounds slice, causing a panic that terminates the server session task. This denial of service does not lead to memory corruption. The vulnerability is resolved in russh version 0.62.4.
Potential Impact
An authenticated SSH client can cause a denial of service by triggering a panic in the server session task, disrupting service availability. There is no impact on confidentiality or integrity, and no memory corruption occurs.
Mitigation Recommendations
Upgrade russh to version 0.62.4 or later to apply the official fix that prevents the denial of service condition. Patch status is confirmed by the vendor advisory indicating the issue is fixed in 0.62.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-12T19:00:33.735Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7e4130bf8831d539e05264
Added to database: 08/13/2026, 22:12:00 UTC
Last enriched: 08/13/2026, 22:26:58 UTC
Last updated: 08/13/2026, 22:28:26 UTC
Views: 4
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