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CVE-2026-55655— Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSH OpenSSH是OpenSSH组织的一个安全管理连接的软件。 OpenSSH存在授权问题漏洞，该漏洞源于X11转发连接允许本地非特权攻击者通过预绑定首选抽象X套接字名称进行劫持，可能导致转发X11流量的机密性受损，包括敏感窗口内容和输入。

CVSS 5.0 · Medium EPSS 0.09% · P1

Affected Version Matrix 11

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:9.9p1-25.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 0:8.0p1-30.el8_10< * unaffected
0:8.0p1-30.el8_10< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:9.9p1-9.el9_8< * unaffected
0:9.9p1-9.el9_8< * unaffected
Red Hat Red Hat Hardened Images 10.3p1-6.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unknown
Red Hat Red Hat Update Infrastructure 5 1786435483< * unaffected
1786533529< * unaffected
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I. Basic Information for CVE-2026-55655

Vulnerability Information
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Vulnerability Title
Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSH 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSH OpenSSH是OpenSSH组织的一个安全管理连接的软件。 OpenSSH存在授权问题漏洞，该漏洞源于X11转发连接允许本地非特权攻击者通过预绑定首选抽象X套接字名称进行劫持，可能导致转发X11流量的机密性受损，包括敏感窗口内容和输入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 0:9.9p1-25.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 8 0:8.0p1-30.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8 0:8.0p1-30.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 9 0:9.9p1-9.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:9.9p1-9.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Hardened Images 10.3p1-6.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Update Infrastructure 5 1786435483 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1786533529 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-55655

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III. Intelligence Information for CVE-2026-55655

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Vendor Advisories for CVE-2026-55655 (7)

Same Patch Batch · Red Hat · 2026-06-23 · 12 CVEs total

CVE-2026-11807 9.6 CRITICAL Eda-server: websocket missing authorization allows credential theft via activation_id spoo
CVE-2026-12112 7.8 HIGH Foreman-mcp-server: mcp server: active session hijacking via insecure session state reuse
CVE-2026-10609 6.8 MEDIUM Openshift/cluster-logging-operator: cluster logging operator creates and forwards servicea
CVE-2026-11820 6.5 MEDIUM Community.general: community.general nexmo — api credentials exposed in get url query stri
CVE-2026-9073 6.2 MEDIUM Foreman-mcp-server: mcp server: insecure sensitive http header sanitization
CVE-2026-11819 5.5 MEDIUM Community.general: community.general keyring_info — os keyring passphrase returned in plai
CVE-2026-12969 5.3 MEDIUM Dnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation
CVE-2026-12892 4.4 MEDIUM Gstreamer1-plugins-bad: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 na
CVE-2026-55653 4.3 MEDIUM Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path du
CVE-2026-12891 4.3 MEDIUM Gstreamer1-plugins-bad: gstreamer1-plugins-bad: global buffer overflow (oob read) in h.266
CVE-2026-55654 3.7 LOW Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi in

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-923

V. Comments for CVE-2026-55655

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