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CVE-2026-65609 is an out-of-bounds write vulnerability in nnn, confirmed in version 5.2. The flaw is caused by insufficient validation of attacker-controlled length fields deserialized from a session file. When nnn loads a crafted session file using the -s option, it can write beyond the bounds of fixed-size global buffers, resulting in corruption of adjacent global state. The issue is triggered during processing of session data supplied through a maliciously crafted session file placed where the victim's nnn instance will load it.
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No public exploit code observed for this vulnerability.
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An unpatched vulnerability tracked as CVE-2026-65609 affecting Linux distributions including Ubuntu LTS and Debian releases, as referenced by a Nessus plugin entry.
An out-of-bounds write vulnerability in nnn caused by insufficient validation of attacker-controlled length fields deserialized from a session file, allowing memory corruption when a crafted session file is loaded with the -s option.
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.