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Affected Component
Analysis
openssh
Patched
Name
CVE-2025-26465
Description
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/security/cve/CVE-2025-26465Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2344780Issue Tracking
https://seclists.org/oss-sec/2025/q1/144Mailing List
https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1237040Issue Tracking
https://lists.debian.org/debian-lts-announce/2025/02/msg00020.htmlThird Party Advisory
https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.htmlThird Party Advisory
https://security-tracker.debian.org/tracker/CVE-2025-26465Third Party Advisory
https://security.netapp.com/advisory/ntap-20250228-0003/Third Party Advisory
https://ubuntu.com/security/CVE-2025-26465Third Party Advisory
https://www.openssh.com/releasenotes.html#9.9p2Release Notes
https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/Press/Media Coverage
https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-opensshThird Party Advisory
https://seclists.org/oss-sec/2025/q1/144Mailing List
Analysis#
Vulnerability Ratings#
6.8
CVSSv31
6.8
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
openssh (yocto:kirkstone)
#
Title
Author
Resolve
1
upstream: Fix cases where error codes were not correctly set
"djm@openbsd.org" <djm@openbsd.org>
CVE-2025-26465
openssh (yocto:scarthgap)
#
Title
Author
Resolve
1
upstream: Fix cases where error codes were not correctly set
"djm@openbsd.org" <djm@openbsd.org>
CVE-2025-26465