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CVE-2026-39830 is a denial-of-service vulnerability in golang.org/x/crypto/ssh. A malicious SSH peer can send unsolicited responses to global requests, causing an internal response buffer to fill and block the SSH connection read loop. The blocked goroutine cannot be released through Close(), creating a resource leak for each affected connection. Fixed versions discard unsolicited global request responses.
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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.
55 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Fedora advisory FEDORA-2026-dd9ec8b0c2; the content provides no technical flaw description.
A vulnerability addressed by the referenced Fedora security advisory; the content provides no technical vulnerability details.
A vulnerability addressed by the openSUSE glab package update; no technical details are provided.
A vulnerability referenced in a Nutanix AOS security notice/plugin, but no specific technical details are 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.