RHSA-2025:3837MediumCVSS 6.8

Red Hat Security Advisory: openssh security update

Published
April 14, 2025
Last Modified
October 21, 2026

🔗 CVE IDs covered (1)

CVE-2025-26465 →

📋 Description

CVE-2025-26465 — openssh: Machine-in-the-middle attack if VerifyHostKeyDNS is enabled

🎯 Affected products91

  • Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-0:8.7p1-38.el9_4.5.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-0:8.7p1-38.el9_4.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-askpass-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-0:8.7p1-38.el9_4.5.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-askpass-debuginfo-0:8.7p1-38.el9_4.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-0:8.7p1-38.el9_4.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • openssh-clients-debuginfo-0:8.7p1-38.el9_4.5.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • +61 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: This issue can be mitigated by disabling VerifyHostKeyDNS by setting that option to 'no' in an SSH client configuration file (such as /etc/ssh/ssh_config, ~/.ssh/config, or one of the files in the /etc/ssh/ssh_config.d/ directory). This is the default configuration in Red Hat Enterprise Linux. For configurations that require VerifyHostKeyDNS to be enabled (set to either 'yes' or 'ask'), mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

🔗 References (4)