Skip to main content
Threat Radar animated logo
EPSS 0.3%top 78%

Red Hat Security Advisory: openssh security update

0
High
VulnerabilityCVE-2026-55653gcveosvubuntu-cve-2026-55653ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-fips-16-04-ltsubuntu-pro-18-04-ltsubuntu-18-04-ltsubuntu-pro-fips-updates-18-04-ubuntu-pro-fips-18-04-ltsubuntu-pro-20-04-ltsubuntu-20-04-ltsubuntu-pro-fips-updates-20-04-ubuntu-pro-fips-20-04-ltsubuntu-22-04-ltsubuntu-pro-fips-preview-22-04-ubuntu-pro-fips-updates-22-04-ubuntu-24-04-ltsubuntu-pro-fips-updates-24-04-ubuntu-25-10ubuntu-26-04-ltscsafcve-2026-55653cve-2026-55654cve-2026-55655cve-2026-59996cve-2026-60002red-hat-product-securitycwe-415ghsa-28f3-55mq-pp68ghsa
Published: 07/30/2026 (07/30/2026, 06:06:38 UTC)
Source: GCVE Database
Vendor/Project: Red Hat Product Security
Product: Red Hat

Description

OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es): * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions (CVE-2026-55655) * openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653) * openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654) * openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002) * openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected software

Ubuntu:Pro:14.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.13+esm2?arch=source&distro=esm-infra-legacy/trusty
Affected versions
=1:6.2p2-6=1:6.2p2-6ubuntu1=1:6.4p1-1=1:6.4p1-2=1:6.5p1-1=1:6.5p1-2=1:6.5p1-3=1:6.5p1-4=1:6.5p1-6=1:6.6p1-1=1:6.6p1-2=1:6.6p1-2ubuntu1=1:6.6p1-2ubuntu2=1:6.6p1-2ubuntu2.2=1:6.6p1-2ubuntu2.3=1:6.6p1-2ubuntu2.4=1:6.6p1-2ubuntu2.6=1:6.6p1-2ubuntu2.7=1:6.6p1-2ubuntu2.8=1:6.6p1-2ubuntu2.10=1:6.6p1-2ubuntu2.11=1:6.6p1-2ubuntu2.12=1:6.6p1-2ubuntu2.13=1:6.6p1-2ubuntu2.13+esm1=1:6.6p1-2ubuntu2.13+esm2
Ubuntu:Pro:16.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.10+esm9?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=1:6.9p1-2=1:6.9p1-3=1:7.1p1-1=1:7.1p1-3=1:7.1p1-4=1:7.1p1-6=1:7.1p2-1=1:7.1p2-2=1:7.2p1-1=1:7.2p2-1=1:7.2p2-2=1:7.2p2-3=1:7.2p2-4=1:7.2p2-4ubuntu1=1:7.2p2-4ubuntu2.1=1:7.2p2-4ubuntu2.2=1:7.2p2-4ubuntu2.4=1:7.2p2-4ubuntu2.5=1:7.2p2-4ubuntu2.6=1:7.2p2-4ubuntu2.7=1:7.2p2-4ubuntu2.8=1:7.2p2-4ubuntu2.10=1:7.2p2-4ubuntu2.10+esm1=1:7.2p2-4ubuntu2.10+esm2=1:7.2p2-4ubuntu2.10+esm3=1:7.2p2-4ubuntu2.10+esm4=1:7.2p2-4ubuntu2.10+esm5=1:7.2p2-4ubuntu2.10+esm6=1:7.2p2-4ubuntu2.10+esm7=1:7.2p2-4ubuntu2.10+esm8=1:7.2p2-4ubuntu2.10+esm9
Ubuntu:Pro:FIPS:16.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.10.7?arch=source&distro=fips-updates/xenial
Affected versions
=1:7.2p2-4ubuntu2.fips.2.2.3=1:7.2p2-4ubuntu2.fips.2.4.1=1:7.2p2-4ubuntu2.fips.2.4.2=1:7.2p2-4ubuntu2.fips.2.8.1=1:7.2p2-4ubuntu2.fips.2.10.1=1:7.2p2-4ubuntu2.fips.2.10.2=1:7.2p2-4ubuntu2.fips.2.10.3=1:7.2p2-4ubuntu2.fips.2.10.4=1:7.2p2-4ubuntu2.fips.2.10.5=1:7.2p2-4ubuntu2.fips.2.10.6=1:7.2p2-4ubuntu2.fips.2.10.7
Ubuntu:Pro:FIPS:16.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.10.1?arch=source&distro=fips/xenial
Affected versions
=1:7.2p2-4ubuntu2.fips.2.2=1:7.2p2-4ubuntu2.fips.2.2.1=1:7.2p2-4ubuntu2.fips.2.10.1
Ubuntu:Pro:18.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:7.6p1-4ubuntu0.7+esm4?arch=source&distro=esm-infra/bionic
Affected versions
=1:7.5p1-10=1:7.6p1-4=1:7.6p1-4ubuntu0.1=1:7.6p1-4ubuntu0.2=1:7.6p1-4ubuntu0.3=1:7.6p1-4ubuntu0.5=1:7.6p1-4ubuntu0.6=1:7.6p1-4ubuntu0.7=1:7.6p1-4ubuntu0.7+esm1=1:7.6p1-4ubuntu0.7+esm2=1:7.6p1-4ubuntu0.7+esm3=1:7.6p1-4ubuntu0.7+esm4
Ubuntu:18.04:LTSmore threats →ghsa
openssh-ssh1
pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-10?arch=source&distro=bionic
Affected versions
=1:7.5p1-8=1:7.5p1-9=1:7.5p1-9build1=1:7.5p1-10
Ubuntu:Pro:FIPS-updates:18.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:7.9p1-10~ubuntu18.04.fips.0.10?arch=source&distro=fips-updates/bionic
Affected versions
=1:7.9p1-10~ubuntu18.04.fips.0.1=1:7.9p1-10~ubuntu18.04.fips.0.2=1:7.9p1-10~ubuntu18.04.fips.0.3=1:7.9p1-10~ubuntu18.04.fips.0.4=1:7.9p1-10~ubuntu18.04.fips.0.5=1:7.9p1-10~ubuntu18.04.fips.0.6=1:7.9p1-10~ubuntu18.04.fips.0.7=1:7.9p1-10~ubuntu18.04.fips.0.8=1:7.9p1-10~ubuntu18.04.fips.0.9=1:7.9p1-10~ubuntu18.04.fips.0.10
Ubuntu:Pro:FIPS:18.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:7.9p1-10~ubuntu18.04.fips.0.2?arch=source&distro=fips/bionic
Affected versions
=1:7.9p1-10~ubuntu18.04.fips.0.1=1:7.9p1-10~ubuntu18.04.fips.0.2
Ubuntu:Pro:20.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.13+esm1?arch=source&distro=esm-infra/focal
Affected versions
=1:8.0p1-6build1=1:8.1p1-1=1:8.1p1-5=1:8.2p1-4=1:8.2p1-4ubuntu0.1=1:8.2p1-4ubuntu0.2=1:8.2p1-4ubuntu0.3=1:8.2p1-4ubuntu0.4=1:8.2p1-4ubuntu0.5=1:8.2p1-4ubuntu0.7=1:8.2p1-4ubuntu0.8=1:8.2p1-4ubuntu0.9=1:8.2p1-4ubuntu0.10=1:8.2p1-4ubuntu0.11=1:8.2p1-4ubuntu0.12=1:8.2p1-4ubuntu0.13=1:8.2p1-4ubuntu0.13+esm1
Ubuntu:20.04:LTSmore threats →ghsa
openssh-ssh1
pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-11build1?arch=source&distro=focal
Affected versions
=1:7.5p1-11build1
Ubuntu:Pro:FIPS-updates:20.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.fips.0.13.1?arch=source&distro=fips-updates/focal
Affected versions
=1:8.2p1-4ubuntu0.fips.0.2.1=1:8.2p1-4ubuntu0.fips.0.4.0=1:8.2p1-4ubuntu0.fips.0.5.0=1:8.2p1-4ubuntu0.fips.0.7=1:8.2p1-4ubuntu0.fips.0.8=1:8.2p1-4ubuntu0.fips.0.9=1:8.2p1-4ubuntu0.fips.0.10=1:8.2p1-4ubuntu0.fips.0.11=1:8.2p1-4ubuntu0.fips.0.12=1:8.2p1-4ubuntu0.fips.0.13=1:8.2p1-4ubuntu0.fips.0.13.1
Ubuntu:Pro:FIPS:20.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.fips.0.2.1?arch=source&distro=fips/focal
Affected versions
=1:8.2p1-4ubuntu0.fips.0.2.1
Ubuntu:22.04:LTSmore threats →ghsa
openssh-ssh1
pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-13?arch=source&distro=jammy
Affected versions
=1:7.5p1-12=1:7.5p1-12build1=1:7.5p1-13
Ubuntu:Pro:FIPS-preview:22.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu1.fips.0~ppa3?arch=source&distro=fips-preview/jammy
Affected versions
=1:8.9p1-3ubuntu0.4+Fips1=1:8.9p1-3ubuntu0.4+Fips3=1:8.9p1-3ubuntu1.fips.0~ppa3
Ubuntu:Pro:FIPS-updates:22.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu1.fips.0~ppa3?arch=source&distro=fips-updates/jammy
Affected versions
=1:8.9p1-3ubuntu0.4+Fips1=1:8.9p1-3ubuntu0.4+Fips3=1:8.9p1-3ubuntu0.6+Fips1=1:8.9p1-3ubuntu0.7+Fips1=1:8.9p1-3ubuntu0.10+Fips1=1:8.9p1-3ubuntu0.11+Fips1=1:8.9p1-3ubuntu0.13+Fips1=1:8.9p1-3ubuntu0.14+Fips1=1:8.9p1-3ubuntu0.15+Fips1=1:8.9p1-3ubuntu0.15+Fips3=1:8.9p1-3ubuntu0.16+Fips3=1:8.9p1-3ubuntu1.fips.0~ppa3
Ubuntu:24.04:LTSmore threats →ghsa
openssh-ssh1
pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-16?arch=source&distro=noble
Affected versions
=1:7.5p1-14=1:7.5p1-15=1:7.5p1-15build1=1:7.5p1-16
Ubuntu:Pro:FIPS-updates:24.04:LTSmore threats →ghsa
openssh
pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.18+Fips1?arch=source&distro=fips-updates/noble
Affected versions
=1:9.6p1-3ubuntu13.7+Fips1=1:9.6p1-3ubuntu13.12+Fips1=1:9.6p1-3ubuntu13.13+Fips1=1:9.6p1-3ubuntu13.14+Fips1=1:9.6p1-3ubuntu13.15+Fips1=1:9.6p1-3ubuntu13.16+Fips1=1:9.6p1-3ubuntu13.16+Fips2=1:9.6p1-3ubuntu13.18+Fips1
Ubuntu:25.10more threats →ghsa
openssh-ssh1
pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-17?arch=source&distro=questing
Affected versions
=1:7.5p1-17
Ubuntu:26.04:LTSmore threats →ghsa
openssh-ssh1
pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-18?arch=source&distro=resolute
Affected versions
=1:7.5p1-17=1:7.5p1-18

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-55653
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a5fd06a1010f89cc218b48c

Added to database: 07/21/2026, 20:02:50 UTC

Last updated: 09/11/2026, 07:31:54 UTC

Views: 105

Community Reviews

0 reviews

Crowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.

Sort by
Loading community insights…

Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.

Actions

Please log in to the Console to use AI analysis features.

Need more coverage?

Upgrade to Pro Console for AI refresh and higher limits.

For incident response and remediation, OffSeq services can help resolve threats faster.

Latest Threats

Breach by OffSeqOFFSEQFRIENDS — 25% OFF

Check if your credentials are on the dark web

Instant breach scanning across billions of leaked records. Free tier available.

Scan now
OffSeq TrainingCredly Certified

Lead Pen Test Professional

Technical5-day eLearningPECB Accredited
View courses