CVE-2026-59845: Vulnerability 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
CVE-2026-59845 is a vulnerability in libssh on Red Hat Enterprise Linux 10 where an unchecked failure of fork() when using ProxyCommand results in storing a process ID of -1. During cleanup, this leads to signals being sent across the caller's accessible process tree, causing a local denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. No vendor advisory indicates an official fix or patch availability at this time.
Potential Impact
The vulnerability can cause a local denial of service by disrupting process signaling due to improper handling of fork() failure in libssh when ProxyCommand is used. There is no impact on confidentiality or integrity. Exploitation requires local access with low privileges and user interaction, and the scope is changed, affecting other processes in the caller's process tree.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-59845 for current remediation guidance. Until a fix is available, avoid using ProxyCommand in libssh or restrict its use to trusted users to reduce risk. Monitor Red Hat's official channels for updates.
CVE-2026-59845: Vulnerability 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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59845 is a vulnerability in libssh on Red Hat Enterprise Linux 10 where an unchecked failure of fork() when using ProxyCommand results in storing a process ID of -1. During cleanup, this leads to signals being sent across the caller's accessible process tree, causing a local denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. No vendor advisory indicates an official fix or patch availability at this time.
Potential Impact
The vulnerability can cause a local denial of service by disrupting process signaling due to improper handling of fork() failure in libssh when ProxyCommand is used. There is no impact on confidentiality or integrity. Exploitation requires local access with low privileges and user interaction, and the scope is changed, affecting other processes in the caller's process tree.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-59845 for current remediation guidance. Until a fix is available, avoid using ProxyCommand in libssh or restrict its use to trusted users to reduce risk. Monitor Red Hat's official channels for updates.
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: 07/21/2026, 11:56:50 UTC
Last updated: 07/21/2026, 12:57:07 UTC
Views: 6
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