CVE-2026-55655 (GCVE-0-2026-55655)
Vulnerability from cvelistv5 – Published: 2026-06-23 03:36 – Updated: 2026-11-12 10:49
VLAI
EPSS
VEX
Title
Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
Summary
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.
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-23 12:21 UTC
CWE
- CWE-923 - Improper Restriction of Communication Channel to Intended Endpoints
Assigner
References
52 references
Impacted products
56 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:9.9p1-25.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:9.9p1-7.el10_0.5 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
||
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:8.0p1-30.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/o:redhat:enterprise_linux:8::baseos |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
0:8.0p1-7.el8_4.3 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream cpe:/o:redhat:rhel_aus:8.4::baseos cpe:/o:redhat:rhel_eus_long_life:8.4::baseos |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
0:8.0p1-7.el8_4.3 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream cpe:/o:redhat:rhel_aus:8.4::baseos cpe:/o:redhat:rhel_eus_long_life:8.4::baseos |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
0:8.0p1-15.el8_6.6 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream cpe:/o:redhat:rhel_aus:8.6::baseos cpe:/o:redhat:rhel_eus_long_life:8.6::baseos |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
Unaffected:
0:8.0p1-15.el8_6.6 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream cpe:/o:redhat:rhel_aus:8.6::baseos cpe:/o:redhat:rhel_eus_long_life:8.6::baseos |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:9.9p1-9.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/o:redhat:enterprise_linux:9::baseos |
||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:8.7p1-30.el9_2.13 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2::appstream cpe:/o:redhat:rhel_e4s:9.2::baseos |
||
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:8.7p1-38.el9_4.10 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4::appstream cpe:/o:redhat:rhel_e4s:9.4::baseos |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:8.7p1-45.el9_6.5 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6::appstream cpe:/o:redhat:rhel_eus:9.6::baseos |
||
| Red Hat | Red Hat Hardened Images |
Unaffected:
10.3p1-6.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
||
| Red Hat | Red Hat OpenShift AI 3.0 |
Unaffected:
1791818590 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.0::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.0 |
Unaffected:
1791818589 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.0::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.0 |
Unaffected:
1791818505 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.0::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.0 |
Unaffected:
1791818496 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.0::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.0 |
Unaffected:
1791818502 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.0::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.0 |
Unaffected:
1793042072 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.0::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.2 |
Unaffected:
1791818602 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.2::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.2 |
Unaffected:
1791818598 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.2::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.2 |
Unaffected:
1791818512 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.2::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.2 |
Unaffected:
1791818587 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.2::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.2 |
Unaffected:
1791818778 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.2::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818782 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818627 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818790 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818874 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818792 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818662 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1791818877 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791883722 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791881612 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791885618 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791881487 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791881732 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791883315 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791881486 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791881769 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1791885505 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791819252 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791818749 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791819206 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791818979 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791819123 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791818901 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791820333 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791819495 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat OpenShift AI 3.5 |
Unaffected:
1791819104 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1786435483 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1786533529 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787135742 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241260 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:rhel_els:6
|
||
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:rhel_els:7
|
||
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
||
| Red Hat | Red Hat OpenShift Container Platform 5 |
cpe:/a:redhat:openshift:5
|
Date Public
2026-06-22 23:22
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{
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"packageName": "openssh",
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{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"versionType": "rpm"
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"cpes": [
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"product": "Red Hat OpenShift AI 3.0",
"vendor": "Red Hat",
"versions": [
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"lessThan": "*",
"status": "unaffected",
"version": "1791818589",
"versionType": "rpm"
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"cpes": [
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"product": "Red Hat OpenShift AI 3.0",
"vendor": "Red Hat",
"versions": [
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"status": "unaffected",
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"versionType": "rpm"
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{
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"cpes": [
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],
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"packageName": "rhai/base-image-tpu-rhel9",
"product": "Red Hat OpenShift AI 3.0",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1791818496",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:openshift_ai:3.0::el9"
],
"defaultStatus": "affected",
"packageName": "rhai/base-image-rocm-rhel9",
"product": "Red Hat OpenShift AI 3.0",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1791818502",
"versionType": "rpm"
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},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
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"url": "https://access.redhat.com/errata/RHSA-2026:82922"
},
{
"name": "RHSA-2026:82923",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:82923"
},
{
"name": "RHSA-2026:89739",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:89739"
},
{
"name": "RHSA-2026:91232",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:91232"
},
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-55655"
},
{
"name": "RHBZ#2462250",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462250"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-04-26T18:39:13.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-06-22T23:22:11.127Z",
"value": "Made public."
}
],
"title": "Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions",
"workarounds": [
{
"lang": "en",
"value": "To mitigate this issue, disable X11 forwarding on OpenSSH clients when it is not required. This can be achieved by avoiding the use of `-X` or `-Y` options when invoking `ssh`, or by setting `ForwardX11 no` in the SSH client configuration file (`~/.ssh/config` or `/etc/ssh/ssh_config`). Disabling X11 forwarding will prevent the client from attempting to establish X11 connections, thereby removing the attack vector."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-923: Improper Restriction of Communication Channel to Intended Endpoints"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-55655",
"datePublished": "2026-06-23T03:36:25.724Z",
"dateReserved": "2026-06-16T23:55:05.737Z",
"dateUpdated": "2026-11-05T21:46:02.857Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.