CVE-2026-59843: Vulnerability in Red Hat Red Hat Enterprise Linux 10
A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.
AI Analysis
Technical Summary
CVE-2026-59843 describes a vulnerability in libssh where a remote authenticated peer can send an SSH_MSG_CHANNEL_OPEN message with a zero maximum packet size. This causes subsequent channel write operations to loop indefinitely, leading to excessive CPU consumption and denial of service. The vulnerability affects Red Hat Enterprise Linux 10, but no explicit affected versions or remediation details are given in the available data. The CVSS 3.1 base score is 6.5, reflecting a medium severity denial of service impact with network attack vector, low attack complexity, and requiring privileges.
Potential Impact
The vulnerability results in denial of service by causing the SSH channel write process to enter an infinite loop, consuming CPU resources. There is no impact on confidentiality or integrity. The attacker must be authenticated to exploit this issue.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-59843 for current remediation guidance. No official fix or workaround is stated in the provided information.
CVE-2026-59843: Vulnerability in Red Hat Red Hat Enterprise Linux 10
Description
A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.
CVSS v3.1
Score 6.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59843 describes a vulnerability in libssh where a remote authenticated peer can send an SSH_MSG_CHANNEL_OPEN message with a zero maximum packet size. This causes subsequent channel write operations to loop indefinitely, leading to excessive CPU consumption and denial of service. The vulnerability affects Red Hat Enterprise Linux 10, but no explicit affected versions or remediation details are given in the available data. The CVSS 3.1 base score is 6.5, reflecting a medium severity denial of service impact with network attack vector, low attack complexity, and requiring privileges.
Potential Impact
The vulnerability results in denial of service by causing the SSH channel write process to enter an infinite loop, consuming CPU resources. There is no impact on confidentiality or integrity. The attacker must be authenticated to exploit this issue.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-59843 for current remediation guidance. No official fix or workaround is stated in the provided information.
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-2026-59843","vendor":"Red Hat"}]
Threat ID: 6a5f5b1f2a4a8d59890f9723
Added to database: 07/21/2026, 11:42:23 UTC
Last enriched: 07/21/2026, 11:56:55 UTC
Last updated: 07/21/2026, 12:57:32 UTC
Views: 6
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