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CVE-2026-40884 is an authentication bypass vulnerability in goshs, a Go-based SimpleHTTPServer, affecting versions prior to 2.0.0-beta.6. When goshs is started with SFTP enabled and the documented basic-auth syntax that uses an empty username and non-empty password, the application accepts the configuration but fails to install an SFTP password authentication handler. This leaves the SFTP service reachable without enforcing password-based authentication. The flaw is triggered specifically by the combination of SFTP mode and a basic-auth credential string in which the username field is empty. Successful exploitation allows remote access to the exposed SFTP file service without valid credentials. The issue was fixed in version 2.0.0-beta.6.
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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.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A predecessor vulnerability involving an empty username configuration that led to failed validation and empty authentication handler initialization, setting the stage for the incomplete fix that resulted in CVE-2026-62325.
An SFTP authentication bypass in goshs that allows an unauthenticated network attacker to access files without a password when the server is started with the empty-username basic-auth syntax together with SFTP enabled.
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.