CVE-2026-55654

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Source
https://cve.org/CVERecord?id=CVE-2026-55654
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55654.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-55654
Downstream
BELL (1)
DEBIAN (1)
ECHO (1)
RHSA (3)
RLSA (2)
UBUNTU (1)
Related
ALSA (2)
Published
2026-06-23T03:37:00Z
Modified
2026-10-16T03:00:03Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination
Details

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.

Database specific 
{
    "cna_assigner": "redhat",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55654.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "fixed": "0:9.9p1-25.el10_2"
                        },
                        {
                            "fixed": "0:9.9p1-9.el9_8"
                        },
                        {
                            "fixed": "0:9.9p1-9.el9_8"
                        },
                        {
                            "fixed": "10.3p1-6.hum1"
                        },
                        {
                            "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
d5dacb43fa30c2f6d7eebbd4c5fcf906c3b5d5d8
Last Affected
94eb6858efecc1b4f02d8a6bd35e149f55c814c8
Database specific
Show details 
{
    "extracted_events": [
        {
            "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

6.*
6.0
7.*
7.0
8.*
8.0
9.*
9.0
Other
V_6_0_P1
V_6_1_P1
V_6_2_P1
V_6_5_P1
V_6_6_P1
V_6_8_P1
V_6_9_P1
V_7_0_P1
V_7_1_P1
V_7_2_P1
V_7_3_P1
V_7_4_P1
V_7_5_P1
V_7_6_P1
V_7_7_P1
V_7_8_P1
V_7_9_P1
V_8_0_P1
V_8_1_P1
V_8_2_P1
V_8_4_P1
V_8_5_P1
V_8_6_P1
V_8_7_P1
V_8_8_P1
V_8_9_P1
V_9_0_P1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55654.json"