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CVE Vulnerabilities

CVE-2026-59998

Improper Following of Specification by Caller

Published: Jul 08, 2026 | Modified: Oct 25, 2026
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
6.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-59998
CWEhttps://cwe.mitre.org/data/definitions/573.html

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

Weakness

The product does not follow or incorrectly follows the specifications as required by the implementation language, environment, framework, protocol, or platform.

Affected Software

NameVendorStart VersionEnd Version
OpensshOpenbsd*10.4 (excluding)
Red Hat Enterprise Linux 10RedHatopenssh-0:9.9p1-29.el10_2*
Red Hat Enterprise Linux 8RedHatopenssh-0:8.0p1-34.el8_10*
Red Hat Enterprise Linux 8RedHatopenssh-0:8.0p1-34.el8_10*
Red Hat Enterprise Linux 9RedHatopenssh-0:9.9p1-13.el9_8*
Red Hat Enterprise Linux 9RedHatopenssh-0:9.9p1-13.el9_8*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:1793734080*
Red Hat Hardened ImagesRedHatopenssh-main-10.4p1-1.hum1*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1793004989*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1793005812*
OpensshUbuntuesm-infra-legacy/trusty*
OpensshUbuntuesm-infra-legacy/xenial*
OpensshUbuntuesm-infra/bionic*
OpensshUbuntuesm-infra/focal*
OpensshUbuntufips-preview/jammy*
OpensshUbuntufips-updates/jammy*
OpensshUbuntufips-updates/noble*
OpensshUbuntujammy*
OpensshUbuntunoble*
OpensshUbuntuquesting*
OpensshUbunturesolute*
OpensshUbuntuupstream*
Openssh-ssh1Ubuntudevel*
Openssh-ssh1Ubuntuesm-apps/bionic*
Openssh-ssh1Ubuntuesm-apps/focal*
Openssh-ssh1Ubuntuesm-apps/jammy*
Openssh-ssh1Ubuntuesm-apps/noble*
Openssh-ssh1Ubuntuesm-apps/resolute*
Openssh-ssh1Ubuntujammy*
Openssh-ssh1Ubuntunoble*
Openssh-ssh1Ubuntuquesting*
Openssh-ssh1Ubunturesolute*
Openssh-ssh1Ubuntustonking*
Openssh-ssh1Ubuntuupstream*

References

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