Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-08T00:17:33 openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side 7.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CWE-825

ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchange. (This outcome occurs only on the client side.)

A flaw was found in OpenSSH. A remote attacker could exploit a use-after-free vulnerability on the client side when a server changes its host key during a key re-exchange. This could lead to high impact on confidentiality and integrity, and low impact on availability.

This Important flaw in OpenSSH client could allow a malicious SSH server to execute arbitrary code on the connecting client due to a use-after-free vulnerability during host key re-exchange. While requiring a connection to a specially crafted server, the potential for high impact on client confidentiality and integrity elevates the severity beyond Moderate. To mitigate this issue, OpenSSH clients should only connect to trusted SSH servers. Enforcing strict host key checking and carefully managing `known_hosts` files can help prevent connections to servers with unexpected or altered host keys, thereby reducing exposure to this client-side vulnerability. Red Hat Hardened Images 2026-07-09T00:00:00Z RHSA-2026:37382 openssh-main-10.4p1-1.hum1 Red Hat Enterprise Linux 10 Affected openssh Red Hat Enterprise Linux 6 Affected openssh Red Hat Enterprise Linux 7 Affected openssh Red Hat Enterprise Linux 8 Affected openssh Red Hat Enterprise Linux 9 Affected openssh Red Hat OpenShift Container Platform 4 Affected rhcos https://www.cve.org/CVERecord?id=CVE-2026-60002 https://nvd.nist.gov/vuln/detail/CVE-2026-60002 https://marc.info/?l=openssh-unix-dev&m=178333966933090&w=2 https://www.openssh.org/releasenotes.html#10.4p1 https://www.openwall.com/lists/oss-security/2026/07/06/5