CVE-2026-55653

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Source
https://cve.org/CVERecord?id=CVE-2026-55653
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55653.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-55653
Downstream
AZL (1)
BELL (1)
DEBIAN (1)
RHSA (7)
RLSA (3)
UBUNTU (1)
Related
ALSA (3)
Published
2026-06-23T03:36:22Z
Modified
2026-10-16T03:00:03Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS Calculator
Summary
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
Details

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).

Database specific 
{
    "cna_assigner": "redhat",
    "cwe_ids": [
        "CWE-415"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55653.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "fixed": "0:9.9p1-25.el10_2"
                        },
                        {
                            "fixed": "0:9.9p1-7.el10_0.5"
                        },
                        {
                            "fixed": "0:8.0p1-30.el8_10"
                        },
                        {
                            "fixed": "0:8.0p1-30.el8_10"
                        },
                        {
                            "fixed": "0:9.9p1-9.el9_8"
                        },
                        {
                            "fixed": "0:9.9p1-9.el9_8"
                        },
                        {
                            "fixed": "0:8.7p1-38.el9_4.10"
                        },
                        {
                            "fixed": "0:8.7p1-45.el9_6.5"
                        },
                        {
                            "fixed": "10.3p1-6.hum1"
                        },
                        {
                            "fixed": "1791818590"
                        },
                        {
                            "fixed": "1791818589"
                        },
                        {
                            "fixed": "1791818505"
                        },
                        {
                            "fixed": "1791818496"
                        },
                        {
                            "fixed": "1791818502"
                        },
                        {
                            "fixed": "1791818602"
                        },
                        {
                            "fixed": "1791818598"
                        },
                        {
                            "fixed": "1791818512"
                        },
                        {
                            "fixed": "1791818587"
                        },
                        {
                            "fixed": "1791818778"
                        },
                        {
                            "fixed": "1791818512"
                        },
                        {
                            "fixed": "1791818782"
                        },
                        {
                            "fixed": "1791818782"
                        },
                        {
                            "fixed": "1791818627"
                        },
                        {
                            "fixed": "1791818790"
                        },
                        {
                            "fixed": "1791818874"
                        },
                        {
                            "fixed": "1791818792"
                        },
                        {
                            "fixed": "1791818662"
                        },
                        {
                            "fixed": "1791818877"
                        },
                        {
                            "fixed": "1791883722"
                        },
                        {
                            "fixed": "1791881612"
                        },
                        {
                            "fixed": "1791885618"
                        },
                        {
                            "fixed": "1791881487"
                        },
                        {
                            "fixed": "1791881732"
                        },
                        {
                            "fixed": "1791883315"
                        },
                        {
                            "fixed": "1791881486"
                        },
                        {
                            "fixed": "1791881769"
                        },
                        {
                            "fixed": "1791885505"
                        },
                        {
                            "fixed": "1791819252"
                        },
                        {
                            "fixed": "1791818749"
                        },
                        {
                            "fixed": "1791819206"
                        },
                        {
                            "fixed": "1791818979"
                        },
                        {
                            "fixed": "1791819123"
                        },
                        {
                            "fixed": "1791818901"
                        },
                        {
                            "fixed": "1791820333"
                        },
                        {
                            "fixed": "1791819495"
                        },
                        {
                            "fixed": "1791819104"
                        },
                        {
                            "fixed": "1786435483"
                        },
                        {
                            "fixed": "1786533529"
                        },
                        {
                            "fixed": "1787135742"
                        },
                        {
                            "fixed": "1787241260"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "InverseAffectedRanges"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/openssh/openssh-portable

Affected ranges

Type
GIT
Repo
https://github.com/openssh/openssh-portable
Events
Introduced
485bab886137bbf8b7ec8df82bd66dc6e5654371
Last Affected
94eb6858efecc1b4f02d8a6bd35e149f55c814c8
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "4.0"
                },
                {
                    "last_affected": "4.0"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "cpe": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "6.0"
                },
                {
                    "last_affected": "6.0"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "cpe": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "7.0"
                },
                {
                    "last_affected": "7.0"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "cpe": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "8.0"
                },
                {
                    "last_affected": "8.0"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "cpe": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "9.0"
                },
                {
                    "last_affected": "9.0"
                }
            ],
            "source": "CPE_STRING"
        }
    ]
}

Affected versions

4.*
4.0
6.*
6.0
7.*
7.0
8.*
8.0
9.*
9.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55653.json"