CVE-2026-55655
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5
- CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
- EPSS probability
- 0.09%
- CWE
- CWE-923
- Published
- 2026-06-23
- Last modified
- 2026-09-01
Affected products
- Red Hat Red Hat Hardened Images
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Update Infrastructure 5
- Red Hat Red Hat Update Infrastructure 5
- Red Hat Red Hat Update Infrastructure 5
- Red Hat Red Hat Update Infrastructure 5
Weakness type
Related vulnerabilities
- CVE-2026-87734 — An issue was discovered in the utcp package before 0.0.6 for OCaml. Out-of-order segment reassembly...
- CVE-2026-62836 — Azure SQL Managed Instance Elevation of Privilege Vulnerability
- CVE-2026-18655 — Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Injection
- CVE-2026-23904 — Apache Kyuubi: Unrestricted access via Kyuubi engine-ui proxy
- CVE-2026-63226 — Printers and Multifunction Printers (MFPs) provided by Ricoh Company, Ltd. do not implement...
- CVE-2026-8920 — Improper Restriction of Communication Channel to Intended Endpoints and External Control of File...
- CVE-2026-59841 — A improper restriction of communication channel to intended endpoints vulnerability in Fortinet...
- CVE-2026-57028 — Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacker