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CVE-2026-59843

MEDIUM
6.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-59843
State
PUBLISHED
Assigner
redhat
Reserved
2026-07-07 15:40 UTC
Published
2026-07-21 11:16 UTC
Last updated
2026-07-22 19:07 UTC
Primary CWE
CWE-400
CWE-400 Uncontrolled Resource Consumption
Vendor / Product
Red Hat / Red Hat Hardened Images
Sources
cve.org  ·  NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (4)
VendorProductPlatformVersions
Red Hat Red Hat Enterprise Linux 10
Red Hat Red Hat Enterprise Linux 8
Red Hat Red Hat Enterprise Linux 9
Red Hat Red Hat Hardened Images 0.12.1-4.hum1 < *
Weakness (CWE)
CWESourceDescription
CWE-400 adp CWE-400 Uncontrolled Resource Consumption
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.5 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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