DEBIAN-CVE-2026-55655

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Source
https://security-tracker.debian.org/tracker/CVE-2026-55655
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55655.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-55655
Upstream
Withdrawn
2026-08-31T20:00:12Z
Published
2026-06-23T04:17:40Z
Modified
2026-08-31T20:00:12Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N CVSS Calculator
Summary
[none]
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.

References

Affected packages

Debian:11 / openssh

Package

Name
openssh
Purl
pkg:deb/debian/openssh?arch=source&distro=bullseye

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:8.*
1:8.4p1-5
1:8.4p1-5+deb11u1
1:8.4p1-5+deb11u2
1:8.4p1-5+deb11u3
1:8.4p1-5+deb11u4
1:8.4p1-5+deb11u5
1:8.4p1-5+deb11u6
1:8.4p1-5+deb11u7
1:8.4p1-6
1:8.7p1-1
1:8.7p1-2
1:8.7p1-3
1:8.7p1-4
1:8.8p1-1
1:8.9p1-1
1:8.9p1-2
1:8.9p1-3
1:9.*
1:9.0p1-1
1:9.1p1-1
1:9.1p1-2
1:9.2p1-1
1:9.2p1-2
1:9.3p1-1
1:9.3p1-1+loong64
1:9.3p2-1
1:9.4p1-1
1:9.5p1-1
1:9.5p1-2
1:9.6p1-1
1:9.6p1-2
1:9.6p1-3
1:9.6p1-4
1:9.6p1-5
1:9.7p1-1
1:9.7p1-2
1:9.7p1-3
1:9.7p1-3+hurd.1
1:9.7p1-4
1:9.7p1-5
1:9.7p1-6
1:9.7p1-7
1:9.8p1-1
1:9.8p1-2
1:9.8p1-3
1:9.8p1-4
1:9.8p1-7
1:9.8p1-8
1:9.9p1-1
1:9.9p1-2
1:9.9p1-3
1:9.9p1-3+hurd.1
1:9.9p2-1
1:9.9p2-2
1:10.*
1:10.0p1-1
1:10.0p1-2
1:10.0p1-3
1:10.0p1-4
1:10.0p1-5~bpo12+2
1:10.0p1-5
1:10.0p1-6
1:10.0p1-7~bpo12+1
1:10.0p1-7
1:10.0p1-8
1:10.1p1-1
1:10.1p1-2
1:10.2p1-1
1:10.2p1-2~bpo13+1
1:10.2p1-2
1:10.2p1-3
1:10.2p1-4
1:10.2p1-5
1:10.2p1-6~bpo13+1
1:10.2p1-6
1:10.3p1-1~bpo13+1
1:10.3p1-1
1:10.3p1-2
1:10.3p1-3
1:10.3p1-4
1:10.3p1-5
1:10.3p1-7
1:10.3p1-8
1:10.3p1-9
1:10.4p1-1
1:10.4p1-2
1:10.4p1-3
1:10.4p1-4
1:10.4p1-5

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55655.json"

Debian:12 / openssh

Package

Name
openssh
Purl
pkg:deb/debian/openssh?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:9.*
1:9.2p1-2
1:9.2p1-2+deb12u1
1:9.2p1-2+deb12u2
1:9.2p1-2+deb12u3
1:9.2p1-2+deb12u4
1:9.2p1-2+deb12u5
1:9.2p1-2+deb12u6
1:9.2p1-2+deb12u7
1:9.2p1-2+deb12u8
1:9.2p1-2+deb12u9
1:9.2p1-2+deb12u10
1:9.3p1-1
1:9.3p1-1+loong64
1:9.3p2-1
1:9.4p1-1
1:9.5p1-1
1:9.5p1-2
1:9.6p1-1
1:9.6p1-2
1:9.6p1-3
1:9.6p1-4
1:9.6p1-5
1:9.7p1-1
1:9.7p1-2
1:9.7p1-3
1:9.7p1-3+hurd.1
1:9.7p1-4
1:9.7p1-5
1:9.7p1-6
1:9.7p1-7
1:9.8p1-1
1:9.8p1-2
1:9.8p1-3
1:9.8p1-4
1:9.8p1-7
1:9.8p1-8
1:9.9p1-1
1:9.9p1-2
1:9.9p1-3
1:9.9p1-3+hurd.1
1:9.9p2-1
1:9.9p2-2
1:10.*
1:10.0p1-1
1:10.0p1-2
1:10.0p1-3
1:10.0p1-4
1:10.0p1-5~bpo12+2
1:10.0p1-5
1:10.0p1-6
1:10.0p1-7~bpo12+1
1:10.0p1-7
1:10.0p1-8
1:10.1p1-1
1:10.1p1-2
1:10.2p1-1
1:10.2p1-2~bpo13+1
1:10.2p1-2
1:10.2p1-3
1:10.2p1-4
1:10.2p1-5
1:10.2p1-6~bpo13+1
1:10.2p1-6
1:10.3p1-1~bpo13+1
1:10.3p1-1
1:10.3p1-2
1:10.3p1-3
1:10.3p1-4
1:10.3p1-5
1:10.3p1-7
1:10.3p1-8
1:10.3p1-9
1:10.4p1-1
1:10.4p1-2
1:10.4p1-3
1:10.4p1-4
1:10.4p1-5

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55655.json"

Debian:13 / openssh

Package

Name
openssh
Purl
pkg:deb/debian/openssh?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:10.*
1:10.0p1-7
1:10.0p1-7+deb13u1
1:10.0p1-7+deb13u2
1:10.0p1-7+deb13u3
1:10.0p1-7+deb13u4
1:10.0p1-8
1:10.1p1-1
1:10.1p1-2
1:10.2p1-1
1:10.2p1-2~bpo13+1
1:10.2p1-2
1:10.2p1-3
1:10.2p1-4
1:10.2p1-5
1:10.2p1-6~bpo13+1
1:10.2p1-6
1:10.3p1-1~bpo13+1
1:10.3p1-1
1:10.3p1-2
1:10.3p1-3
1:10.3p1-4
1:10.3p1-5
1:10.3p1-7
1:10.3p1-8
1:10.3p1-9
1:10.4p1-1
1:10.4p1-2
1:10.4p1-3
1:10.4p1-4
1:10.4p1-5

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55655.json"

Debian:14 / openssh

Package

Name
openssh
Purl
pkg:deb/debian/openssh?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:10.*
1:10.0p1-7
1:10.0p1-8
1:10.1p1-1
1:10.1p1-2
1:10.2p1-1
1:10.2p1-2~bpo13+1
1:10.2p1-2
1:10.2p1-3
1:10.2p1-4
1:10.2p1-5
1:10.2p1-6~bpo13+1
1:10.2p1-6
1:10.3p1-1~bpo13+1
1:10.3p1-1
1:10.3p1-2
1:10.3p1-3
1:10.3p1-4
1:10.3p1-5
1:10.3p1-7
1:10.3p1-8
1:10.3p1-9
1:10.4p1-1
1:10.4p1-2
1:10.4p1-3
1:10.4p1-4
1:10.4p1-5

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55655.json"