CVE record · CVE-2026-55653

Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service

CVSS 4.3 MediumEPSS 0.0053 · 44th percentile

Published by the CVE Program (CNA: redhat) at 23 Jun 2026, 03:36 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 10 Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:9.9p1-25.el10_2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:9.9p1-7.el10_0.5 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:8.0p1-30.el8_10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:8.0p1-30.el8_10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:9.9p1-9.el9_8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:9.9p1-9.el9_8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:8.7p1-30.el9_2.13 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:8.7p1-38.el9_4.10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support Package name: openssh https://access.redhat.com/downloads/content/package-browser/	unaffected 0:8.7p1-45.el9_6.5 to before * rpm Other versions: affected
Red Hat	Red Hat Hardened Images Package name: openssh-main https://catalog.redhat.com/software/containers/	unaffected 10.3p1-6.hum1 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.0 Package name: rhai/base-image-cuda-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818590 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.0 Package name: rhai/base-image-cpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818589 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.0 Package name: rhai/base-image-spyre-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818505 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.0 Package name: rhai/base-image-tpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818496 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.0 Package name: rhai/base-image-rocm-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818502 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.0 Package name: rhai/base-image-cpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1793042072 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.2 Package name: rhai/base-image-spyre-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818602 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.2 Package name: rhai/base-image-cpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818598 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.2 Package name: rhai/base-image-tpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818512 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.2 Package name: rhai/base-image-cuda-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818587 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.2 Package name: rhai/base-image-rocm-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818778 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.2 Package name: rhai/base-image-rocm-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818512 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-tpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818782 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-rocm-6.4-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818782 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-cuda-12.9-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818627 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-rocm-7.0-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818790 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-cpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818874 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-neuron-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818792 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-cuda-13.0-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818662 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.3 Package name: rhai/base-image-spyre-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791818877 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-neuron-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791883722 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-cuda-12.9-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791881612 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-cpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791885618 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-rocm-6.4-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791881487 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-spyre-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791881732 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-rocm-7.1-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791883315 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-gaudi-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791881486 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-tpu-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791881769 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.4 Package name: rhai/base-image-cuda-13.0-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791885505 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift AI 3.5 Package name: rhai/base-image-spyre-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791819252 to before * rpm Other versions: affected

And 17 more products. The full list is on the CVE record.

Identifiers: CVE-2026-55653
CNA: redhat
Weakness (CWE): CWE-415
Tags: Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Red Hat Enterprise Linux 9.6 Extended Update Support
Red Hat Hardened Images
Memory corruption
Published: 23 Jun 2026
Updated: 5 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.3	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L	CNA (redhat)

CISA KEV Not listed.
EPSS 0.0053, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

23 Jun 2026, 03:36 UTC Confirmed by the CVE List
23 Jun 2026, 04:17 UTC Confirmed by NVD

Sources

References from the CNA

access.redhat.com/errata/RHSA-2026:36759 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:47755 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:47756 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:47757 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:54387 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:58981 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:76748 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:76993 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:80513 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82749 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82750 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82751 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82752 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82753 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82754 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82755 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82756 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82757 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82758 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82759 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82761 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82762 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82763 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82897 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82898 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82899 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82900 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82901 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82902 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82903 vendor-advisoryredhat

And 20 more on the CVE record.

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.