CVE-2026-55655

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Source
https://cve.org/CVERecord?id=CVE-2026-55655
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55655.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55655
Downstream
AZL (1)
BELL (1)
DEBIAN (1)
ECHO (1)
MGASA (1)
RHSA (7)
RLSA (3)
UBUNTU (1)
Related
ALSA (3)
Published
2026-06-23T03:36:25Z
Modified
2026-10-21T02:58:38Z
Severity
  • 5.0 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N CVSS Calculator
Summary
Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
Details

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.

Database specific 
{
    "cna_assigner":  "redhat",
    "cwe_ids":  [
        "CWE-923"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55655.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
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/cve-osv-conversion/osv-output/CVE-2026-55655.json"