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EPSS 0.2%top 92%

sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows…

0
Medium
VulnerabilityCVE-2026-59998gcveosvubuntu-cve-2026-59998ubuntu-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-lts
Published: 07/08/2026 (07/08/2026, 01:16:00 UTC)
Source: GCVE Database
Product: openssh

Description

sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.

CVSS v3.1

Score 4.8medium

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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
pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu0.16?arch=source&distro=jammy
Affected versions
<1:8.9p1-3ubuntu0.16=1:8.4p1-6ubuntu2=1:8.7p1-2=1:8.7p1-2build1=1:8.7p1-4=1:8.8p1-1=1:8.9p1-3=1:8.9p1-3ubuntu0.1=1:8.9p1-3ubuntu0.3=1:8.9p1-3ubuntu0.4=1:8.9p1-3ubuntu0.5=1:8.9p1-3ubuntu0.6=1:8.9p1-3ubuntu0.7=1:8.9p1-3ubuntu0.10=1:8.9p1-3ubuntu0.11=1:8.9p1-3ubuntu0.13=1:8.9p1-3ubuntu0.14=1:8.9p1-3ubuntu0.15
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
pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.18?arch=source&distro=noble
Affected versions
<1:9.6p1-3ubuntu13.18=1:9.3p1-1ubuntu3=1:9.4p1-1ubuntu1=1:9.6p1-3ubuntu1=1:9.6p1-3ubuntu2=1:9.6p1-3ubuntu11=1:9.6p1-3ubuntu12=1:9.6p1-3ubuntu13=1:9.6p1-3ubuntu13.3=1:9.6p1-3ubuntu13.4=1:9.6p1-3ubuntu13.5=1:9.6p1-3ubuntu13.7=1:9.6p1-3ubuntu13.8=1:9.6p1-3ubuntu13.9=1:9.6p1-3ubuntu13.11=1:9.6p1-3ubuntu13.12=1:9.6p1-3ubuntu13.13=1:9.6p1-3ubuntu13.14=1:9.6p1-3ubuntu13.15=1:9.6p1-3ubuntu13.16
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
pkg:deb/ubuntu/openssh@1:10.0p1-5ubuntu5.4?arch=source&distro=questing
Affected versions
=1:9.9p1-3ubuntu3=1:9.9p1-3ubuntu3.1=1:10.0p1-5ubuntu2=1:10.0p1-5ubuntu3=1:10.0p1-5ubuntu4=1:10.0p1-5ubuntu5=1:10.0p1-5ubuntu5.1=1:10.0p1-5ubuntu5.4
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
pkg:deb/ubuntu/openssh@1:10.2p1-2ubuntu3.4?arch=source&distro=resolute
Affected versions
<1:10.2p1-2ubuntu3.4=1:10.0p1-5ubuntu5=1:10.2p1-2ubuntu1=1:10.2p1-2ubuntu3=1:10.2p1-2ubuntu3.2
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-2026-59998
Osv Schema Version
1.7.0
Aliases
[]
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"]
Database Specific Severity
null
Cvss Version
3.1

Threat ID: 6a5fd06a1010f89cc218b474

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

Last updated: 07/31/2026, 19:24:50 UTC

Views: 8

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