CVE-2026-42254

Executive Summary

The Hickory DNS hickory-recursor vulnerability has a medium severity rating and a low CVSS score, indicating a relatively low likelihood of exploitation. However, the vulnerability can still be exploited to compromise DNS resolution, leading to malicious activities. The business impact of this vulnerability is moderate, as it can affect the integrity of DNS resolution and potentially lead to security breaches.

The Hickory DNS hickory-recursor versions 0.1 through 0.25.2 are vulnerable to cross-zone poisoning due to a flaw in cache management. Specifically, the cached data is not directly associated with the query that triggered the response, allowing an attacker to inject malicious data into the cache. This can lead to compromised DNS resolution, where an attacker can redirect users to malicious websites or intercept sensitive information. The attack vector for this vulnerability involves an attacker sending a carefully crafted query to the vulnerable DNS server, which then caches the malicious response. The potential impact of this vulnerability is significant, as it can compromise the integrity of DNS resolution, leading to a range of malicious activities such as phishing, malware distribution, and data theft.

Exploitation Context

An attacker can exploit this vulnerability by sending a carefully crafted query to the vulnerable DNS server, which then caches the malicious response. The attacker's motivation to exploit this vulnerability is to compromise the integrity of DNS resolution, potentially leading to phishing, malware distribution, or data theft.

Patch Priority

Recommended Actions

• Update Hickory DNS hickory-recursor to a version later than 0.25.2
• Implement DNS query validation and caching mechanisms to prevent cross-zone poisoning
• Monitor DNS traffic for suspicious activity and implement incident response plans

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