Upstream information

CVE-2026-55653 at MITRE

Description

A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail CNA (Red Hat) National Vulnerability Database
Base Score 4.3 6.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction Required Required
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact Low High
CVSSv3 Version 3.1 3.1
No SUSE Bugzilla entries cross referenced.

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 10
  • openssh >= 9.9p1-25.el10_2
  • openssh-askpass >= 9.9p1-25.el10_2
  • openssh-clients >= 9.9p1-25.el10_2
  • openssh-keycat >= 9.9p1-25.el10_2
  • openssh-keysign >= 9.9p1-25.el10_2
  • openssh-server >= 9.9p1-25.el10_2
 Patchnames:
RHSA-2026:47757
SUSE Liberty Linux 8
  • openssh >= 8.0p1-30.el8_10
  • openssh-askpass >= 8.0p1-30.el8_10
  • openssh-cavs >= 8.0p1-30.el8_10
  • openssh-clients >= 8.0p1-30.el8_10
  • openssh-keycat >= 8.0p1-30.el8_10
  • openssh-ldap >= 8.0p1-30.el8_10
  • openssh-server >= 8.0p1-30.el8_10
  • pam_ssh_agent_auth >= 0.10.3-7.30.el8_10
 Patchnames:
RHSA-2026:47755
SUSE Liberty Linux 9
  • openssh >= 9.9p1-9.el9_8
  • openssh-askpass >= 9.9p1-9.el9_8
  • openssh-clients >= 9.9p1-9.el9_8
  • openssh-keycat >= 9.9p1-9.el9_8
  • openssh-server >= 9.9p1-9.el9_8
  • pam_ssh_agent_auth >= 0.10.4-7.9.el9_8
 Patchnames:
RHSA-2026:47756

SUSE Timeline for this CVE

CVE page created: Wed Jul 29 21:52:55 2026
CVE page last modified: Fri Jul 31 20:39:08 2026