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).
Metrics
CVSS 3.1 6.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat OpenShift Container Platform 4.13 | — |
| Red Hat | Red Hat Hardened Images | — |
| Red Hat | Red Hat OpenShift AI 3.0 | — |
| Red Hat | Red Hat OpenShift AI 3.0 | — |
| Red Hat | Red Hat OpenShift AI 3.0 | — |
| Red Hat | Red Hat OpenShift AI 3.0 | — |
| Red Hat | Red Hat OpenShift AI 3.0 | — |
| Red Hat | Red Hat OpenShift AI 3.0 | — |
| Red Hat | Red Hat OpenShift AI 3.2 | — |
| Red Hat | Red Hat OpenShift AI 3.2 | — |
| Red Hat | Red Hat OpenShift AI 3.2 | — |
| Red Hat | Red Hat OpenShift AI 3.2 | — |
| Red Hat | Red Hat OpenShift AI 3.2 | — |
| Red Hat | Red Hat OpenShift AI 3.2 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.3 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — |
| Red Hat | Red Hat OpenShift AI 3.5 | — |
| Red Hat | Red Hat OpenShift AI 3.5 | — |
| Red Hat | Red Hat OpenShift AI 3.5 | — |
| Red Hat | Red Hat OpenShift AI 3.5 | — |
| Red Hat | Red Hat OpenShift AI 3.5 | — |
| Red Hat | Red Hat OpenShift AI 3.5 | — |
References
- https://access.redhat.com/errata/RHSA-2026:36759
- https://access.redhat.com/errata/RHSA-2026:47755
- https://access.redhat.com/errata/RHSA-2026:47756
- https://access.redhat.com/errata/RHSA-2026:47757
- https://access.redhat.com/errata/RHSA-2026:54387
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/errata/RHSA-2026:76748
- https://access.redhat.com/errata/RHSA-2026:76993
- https://access.redhat.com/errata/RHSA-2026:80513
- https://access.redhat.com/errata/RHSA-2026:82749
- https://access.redhat.com/errata/RHSA-2026:82750
- https://access.redhat.com/errata/RHSA-2026:82751
- https://access.redhat.com/errata/RHSA-2026:82752
- https://access.redhat.com/errata/RHSA-2026:82753
- https://access.redhat.com/errata/RHSA-2026:82754
- https://access.redhat.com/errata/RHSA-2026:82755
- https://access.redhat.com/errata/RHSA-2026:82756
- https://access.redhat.com/errata/RHSA-2026:82757
- https://access.redhat.com/errata/RHSA-2026:82758
- https://access.redhat.com/errata/RHSA-2026:82759
- https://access.redhat.com/errata/RHSA-2026:82761
- https://access.redhat.com/errata/RHSA-2026:82762
- https://access.redhat.com/errata/RHSA-2026:82763
- https://access.redhat.com/errata/RHSA-2026:82897
- https://access.redhat.com/errata/RHSA-2026:82898
- https://access.redhat.com/errata/RHSA-2026:82899
- https://access.redhat.com/errata/RHSA-2026:82900
- https://access.redhat.com/errata/RHSA-2026:82901
- https://access.redhat.com/errata/RHSA-2026:82902
- https://access.redhat.com/errata/RHSA-2026:82903
- https://access.redhat.com/errata/RHSA-2026:82904
- https://access.redhat.com/errata/RHSA-2026:82907
- https://access.redhat.com/errata/RHSA-2026:82908
- https://access.redhat.com/errata/RHSA-2026:82909
- https://access.redhat.com/errata/RHSA-2026:82910
- https://access.redhat.com/errata/RHSA-2026:82912
- https://access.redhat.com/errata/RHSA-2026:82913
- https://access.redhat.com/errata/RHSA-2026:82914
- https://access.redhat.com/errata/RHSA-2026:82915
- https://access.redhat.com/errata/RHSA-2026:82916
- https://access.redhat.com/errata/RHSA-2026:82917
- https://access.redhat.com/errata/RHSA-2026:82918
- https://access.redhat.com/errata/RHSA-2026:82920
- https://access.redhat.com/errata/RHSA-2026:82921
- https://access.redhat.com/errata/RHSA-2026:82922
- https://access.redhat.com/errata/RHSA-2026:82923
- https://access.redhat.com/errata/RHSA-2026:89739
- https://access.redhat.com/errata/RHSA-2026:91232
- https://access.redhat.com/errata/RHSA-2026:95745
- https://access.redhat.com/errata/RHSA-2026:99573
- https://access.redhat.com/errata/RHSA-2026:99592
- https://access.redhat.com/security/cve/CVE-2026-55653Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2462351Exploit, Issue Tracking, Vendor Advisory
Timeline
- Published
- Jun 23, 2026
- Last modified
- Nov 12, 2026
- NVD status
- Modified