CVE-2026-35393 Security Alert: CRITICAL Vulnerability

Urgent: CVE-2026-35393 requires immediate attention.

· 3 min read

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Executive Summary

A critical vulnerability, CVE-2026-35393, has been identified in the github.com/patrickhener/goshs package. This issue allows unauthenticated attackers to perform arbitrary file writes to any existing directory on the filesystem due to improper sanitization of upload paths. With a CVSS score of 9.8, this vulnerability poses a severe risk to solo developers and small teams using the affected package.

Immediate Action

  • Immediately review your project's dependencies for github.com/patrickhener/goshs.
  • Implement a temporary workaround by restricting access to your upload functionality.
  • Monitor for any unusual file changes or uploads to your server.
  • Check for updates or patches from the vendor and apply them as soon as they are available.
  • Review your application's configuration to ensure proper directory access controls are in place.
  • Consider isolating the affected service until a resolution is confirmed.

Affected Versions

  • github.com/patrickhener/goshs@<=1.0.0 vulnerable; upgrade to 1.0.1+

Resolution Guide

As of now, no official patch has been released. Monitor the vendor's repository for updates. In the meantime, consider applying the following temporary measures:

# Example command to update the package (replace with actual version when available)
go get github.com/patrickhener/goshs@latest

For configuration hardening, ensure that the upload directory is restricted:

func uploadHandler(w http.ResponseWriter, r *http.Request) {
    // Check if target directory is within the webroot
    if !isSafeDirectory(r.URL.Path) {
        http.Error(w, "Forbidden", http.StatusForbidden)
        return
    }
    // existing upload logic...
}

Detection & Verification

To check if your application is vulnerable, execute the following command to verify the installed version:

go list -m all | grep github.com/patrickhener/goshs

To verify that the vulnerability has been patched, ensure you're running a version greater than 1.0.0:

go list -m all | grep github.com/patrickhener/goshs

Risk and Impact

Exploitation of CVE-2026-35393 allows an attacker to write files to any directory on the server, potentially leading to data loss, unauthorized access, or complete server compromise. The risk is particularly high for solo developers and small teams, who may lack the resources to effectively monitor and respond to such attacks.

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