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CVE-2025-26465 is a host verification flaw in the OpenSSH client affecting configurations where VerifyHostKeyDNS is enabled, including settings such as "yes" or "ask". The vulnerability stems from incorrect handling of error states during host key verification, allowing an on-path attacker to impersonate a legitimate SSH server under specific conditions. Reported affected versions include OpenSSH 6.8p1 through 9.9p1. The issue is in the client-side verification logic rather than the server daemon itself, and it can permit acceptance of an attacker-controlled host key during SSH connection establishment.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A known SSH/OpenSSH vulnerability present on the operator's server, mentioned as part of the host's unpatched exposure.
An OpenSSH man-in-the-middle vulnerability identified on the compromised Spanish server used to host the final payload.
An OpenSSH vulnerability that can enable an active machine-in-the-middle (MitM) attack under certain conditions.
Unknown (listed as a trending CVE affecting Western Digital; no technical details provided in the content).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.