synced 14 MIN AGO
01 Record

CVE-2026-55655

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

MediumPUBLISHEDCNA: redhat
CNA base score5.0 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.12% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 2.1% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-10-26.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-23 03:36Z4 MO AGO
Last updated
2026-10-26 03:28Z3 DAYS AGO
Reserved
2026-06-16
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Medium (CVSS 5.0)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
Weaknesses
  • CWE-923Improper Restriction of Communication Channel to Intended EndpointsClass
Data version
5.2
Document digest
07de1893f4e00ad5317baa05566432681753f7020221d4b445f733c22c855860

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Enterprise Linux 10Not specified—
Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified—
Red HatRed Hat Hardened ImagesNot specified—
Red HatRed Hat OpenShift AI 3.0Not specified—
Red HatRed Hat OpenShift AI 3.2Not specified—
Red HatRed Hat OpenShift AI 3.3Not specified—
Red HatRed Hat OpenShift AI 3.4Not specified—
Red HatRed Hat OpenShift AI 3.5Not specified—
Red HatRed Hat Update Infrastructure 5Not specified—
Red HatRed Hat Enterprise Linux 6Not specified—
Red HatRed Hat Enterprise Linux 7Not specified—
Red HatRed Hat OpenShift Container Platform 4Not specified—

06 References

07 Fixed in

AlmaLinux 8

  • openssh
    Fixed in 8.0p1-30.el8_10
  • openssh-askpass
    Fixed in 8.0p1-30.el8_10
  • openssh-cavs
    Fixed in 8.0p1-30.el8_10
  • openssh-clients
    Fixed in 8.0p1-30.el8_10
  • openssh-keycat
    Fixed in 8.0p1-30.el8_10
  • openssh-ldap
    Fixed in 8.0p1-30.el8_10
  • openssh-server
    Fixed in 8.0p1-30.el8_10
  • pam_ssh_agent_auth
    Fixed in 0.10.3-7.30.el8_10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • openssh
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-askpass
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-clients
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-keycat
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-server
    Fixed in 9.9p1-9.el9_8.alma.1
  • pam_ssh_agent_auth
    Fixed in 0.10.4-7.9.el9_8.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • openssh
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-askpass
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-clients
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-keycat
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-keysign
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-server
    Fixed in 9.9p1-25.el10_2.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • openssh
    Fixed in 8.0p1-30.el8_10
  • openssh-askpass
    Fixed in 8.0p1-30.el8_10
  • openssh-cavs
    Fixed in 8.0p1-30.el8_10
  • openssh-clients
    Fixed in 8.0p1-30.el8_10
  • openssh-keycat
    Fixed in 8.0p1-30.el8_10
  • openssh-ldap
    Fixed in 8.0p1-30.el8_10
  • openssh-server
    Fixed in 8.0p1-30.el8_10
  • pam_ssh_agent_auth
    Fixed in 0.10.3-7.30.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • openssh
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-askpass
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-clients
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-keycat
    Fixed in 9.9p1-9.el9_8.alma.1
  • openssh-server
    Fixed in 9.9p1-9.el9_8.alma.1
  • pam_ssh_agent_auth
    Fixed in 0.10.4-7.9.el9_8.alma.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • openssh
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-askpass
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-clients
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-keycat
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-keysign
    Fixed in 9.9p1-25.el10_2.alma.1
  • openssh-server
    Fixed in 9.9p1-25.el10_2.alma.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • openssh
    No fix yet
  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • openssh-ssh1
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.