Red Hat Enterprise Linux 10 · denial of service
Historical advisory recorded 12 Nov 2026 11:53:18 UTC. Read the latest advisory.
cve-program · CVE-2026-55653
PublishedA 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).
Read the publisher's advisoryAffected versions, risk and source history
Related advisories and sources
Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.
CVE-2026-55653 · CVE overview and exploitation status
cve-program · CVE-2026-55653
- 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-2026-55653
- https://bugzilla.redhat.com/show_bug.cgi?id=2462351
This historical advisory does not include today's related changes. Open the latest advisory to find current connections.