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CVE-2026-26239 is a stack-based buffer overflow vulnerability affecting QNAP File Station 5. According to QNAP, a remote attacker who has obtained a valid user account can exploit the flaw to modify memory or crash processes. Supporting context indicates the issue is associated with file upload handling in CGI components and can be triggered via excessively long filenames during upload operations. QNAP states the issue is fixed in File Station 5 version 5.5.6.5208 and later.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stack-based buffer overflow vulnerability in QNAP NAS products that can enable unauthorized actions or crash CGI services via excessively long filenames during file uploads.
A buffer overflow vulnerability in QNAP File Station 5 that can be exploited by a remote attacker with a user account to modify memory or crash processes.
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.