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
Published
2026-06-23T03:36:25.724Z
Modified
2026-07-15T01:49:08.571051049Z
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"
}
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 
{
    "source": "CPE_STRING",
    "extracted_events": [
        {
            "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"
        }
    ],
    "cpe": [
        "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:*:*:*:*:*:*:*"
    ]
}

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"