Loop with Unreachable Exit Condition ('Infinite Loop') Affecting libssh package, versions <0:0.10.4-19.el9_8


Severity

Recommended
0.0
medium
0
10

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.57% (45th percentile)

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  • Snyk IDSNYK-ORACLE9-LIBSSH-19639825
  • published7 Sept 2026
  • disclosed21 Jul 2026

Introduced: 21 Jul 2026

CVE-2026-59843  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade Oracle:9 libssh to version 0:0.10.4-19.el9_8 or higher.
This issue was patched in ELSA-2026-62217-0.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh package and not the libssh package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

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 Base Scores

version 3.1