🛡️ MGASA-2026-0135 — dnsmasq (CVE-2026-2291 +5 more)

Updated dnsmasq packages fix security vulnerabilities

CVE-2026-2291: 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-2026-4890: 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-2026-4891: 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-2026-4892: 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-2026-4893: 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-2026-5172: 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.