CVE-2026-55653

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Source
https://cve.org/CVERecord?id=CVE-2026-55653
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55653.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55653
Downstream
Published
2026-06-23T03:36:22.741Z
Modified
2026-07-10T03:53:36.502798867Z
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 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55653.json",
    "cna_assigner": "redhat",
    "cwe_ids": [
        "CWE-415"
    ]
}
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 
{
    "source": "CPE_STRING",
    "cpe": [
        "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*",
        "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*",
        "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*",
        "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
        "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "4.0"
        },
        {
            "last_affected": "4.0"
        },
        {
            "introduced": "6.0"
        },
        {
            "last_affected": "6.0"
        },
        {
            "introduced": "7.0"
        },
        {
            "last_affected": "7.0"
        },
        {
            "introduced": "8.0"
        },
        {
            "last_affected": "8.0"
        },
        {
            "introduced": "9.0"
        },
        {
            "last_affected": "9.0"
        }
    ]
}

Affected versions

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

Database specific

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