Bug 2433121 (CVE-2026-0966) - CVE-2026-0966 libssh: libssh: Denial of Service via zero-length input in ssh_get_hexa()
Summary: CVE-2026-0966 libssh: libssh: Denial of Service via zero-length input in ssh_...
Keywords:
Status: NEW
Alias: CVE-2026-0966
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2442912 2442913
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-26 23:21 UTC by OSIDB Bzimport
Modified: 2026-06-02 08:28 UTC (History)
7 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:18160 0 None None None 2026-05-19 08:44:27 UTC
Red Hat Product Errata RHSA-2026:18683 0 None None None 2026-05-19 13:00:50 UTC

Description OSIDB Bzimport 2026-01-26 23:21:47 UTC 
The API function `ssh_get_hexa()` is vulnerable, when 0-lenght
input is provided to this function. This function is used internally
in `ssh_get_fingerprint_hash()` and `ssh_print_hexa()` (deprecated),
which is vulnerable to the same input (length is provided by the
calling application).

The function is also used internally in the gssapi code for logging
the OIDs received by the server during GSSAPI authentication. This
could be triggered remotely, when the server allows GSSAPI authentication
and logging verbosity is set at least to SSH_LOG_PACKET (3). This
could cause self-DoS of the per-connection daemon process.
Comment 2 errata-xmlrpc 2026-05-19 08:44:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:18160 https://access.redhat.com/errata/RHSA-2026:18160
Comment 3 errata-xmlrpc 2026-05-19 13:00:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:18683 https://access.redhat.com/errata/RHSA-2026:18683
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