CVE-2026-59845: Detection of Error Condition Without Action in Red Hat Red Hat Enterprise Linux 10
A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
AI Analysis
Technical Summary
This vulnerability in libssh occurs when the ProxyCommand feature is used and a fork() system call fails without proper error handling. The failure is stored as a process ID of -1, and during cleanup, signals may be sent across the caller's accessible process tree, causing disruption and local denial of service. The issue is tracked as CWE-390 (Detection of Error Condition Without Action). Red Hat has released updated libssh packages (version 0.12.1-4.hum1) to address this flaw in their Hardened Images RPMs.
Potential Impact
The vulnerability leads to a local denial of service by disrupting system availability through improper signal handling caused by unchecked fork() failures in ProxyCommand usage. There is no impact on confidentiality or integrity. The attack requires local access with low privileges and user interaction, and has a high attack complexity.
Mitigation Recommendations
Red Hat has released updated libssh packages that fix this vulnerability. Users should apply the available updates to libssh packages (libssh-0.12.1-4.hum1 and related RPMs) in Red Hat Hardened Images. Until the update is applied, avoiding the use of the ProxyCommand feature in libssh client configurations will mitigate the risk by preventing the vulnerable code path from being exercised.
CVE-2026-59845: Detection of Error Condition Without Action in Red Hat Red Hat Enterprise Linux 10
Description
A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in libssh occurs when the ProxyCommand feature is used and a fork() system call fails without proper error handling. The failure is stored as a process ID of -1, and during cleanup, signals may be sent across the caller's accessible process tree, causing disruption and local denial of service. The issue is tracked as CWE-390 (Detection of Error Condition Without Action). Red Hat has released updated libssh packages (version 0.12.1-4.hum1) to address this flaw in their Hardened Images RPMs.
Potential Impact
The vulnerability leads to a local denial of service by disrupting system availability through improper signal handling caused by unchecked fork() failures in ProxyCommand usage. There is no impact on confidentiality or integrity. The attack requires local access with low privileges and user interaction, and has a high attack complexity.
Mitigation Recommendations
Red Hat has released updated libssh packages that fix this vulnerability. Users should apply the available updates to libssh packages (libssh-0.12.1-4.hum1 and related RPMs) in Red Hat Hardened Images. Until the update is applied, avoiding the use of the ProxyCommand feature in libssh client configurations will mitigate the risk by preventing the vulnerable code path from being exercised.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-07-07T15:40:24.561Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-59845","vendor":"Red Hat"}]
Threat ID: 6a5f5b1f2a4a8d59890f9727
Added to database: 07/21/2026, 11:42:23 UTC
Last enriched: 08/12/2026, 13:30:23 UTC
Last updated: 09/02/2026, 22:52:13 UTC
Views: 73
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