Dnsmasq vulnerabilities

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Published CVEs affecting Dnsmasq products: 7 record(s), with severity, exploitation and fixes.

Dnsmasq 6 Dnsmasq-utils 1

Exploited only (KEV) →

CVE-2026-5172 High · 7.3 CWE-125 May 11, 2026

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.

CVE-2026-4893 Medium · 5.3 May 11, 2026

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

CVE-2026-4892 High · 8.4 CWE-122 May 11, 2026

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

CVE-2026-4891 Medium · 5.3 CWE-125 May 11, 2026

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

CVE-2026-4890 High · 7.5 CWE-835 May 11, 2026

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

CVE-2026-2291 High · 7.3 May 11, 2026

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

CVE-2020-37127 Medium · 5.5 CWE-121 Feb 5, 2026

dnsmasq-utils 2.79-1 - 'dhcp_release' Denial of Service

Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attackers to cause a denial of service by supplying excessive input. Attackers can trigger a core dump and terminate the dhcp_release process by sending a crafted input string longer than 16 characters.