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CVE-2026-35387 is an OpenSSH sshd(8) vulnerability affecting versions before 10.3 in the handling of ECDSA key algorithm restrictions. When PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms contains any ECDSA algorithm entry, sshd may incorrectly treat that configuration as permitting all ECDSA algorithms instead of enforcing only the explicitly listed algorithm names. As a result, intended cryptographic policy restrictions for public-key or host-based authentication are applied incompletely for ECDSA keys. The flaw is an authorization and policy-enforcement error in algorithm selection logic rather than a memory-safety issue.
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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 public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.