CVE-2026-42004

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS options that DNSdist did not filter...

CVE-2026-42004

CVE-2026-42004 affects DNSdist via EDNS OPT handling. An attacker can craft an EDNS OPT record that DNSdist’s filtering ignores, but is rewritten to a valid OPT when EDNS Client Subnet is applied, allowing the backend to observe EDNS options DNSdist did not filter. Impact is limited to informatio...

CVE-2026-42004 EDNS options smuggling

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS options that DNSdist did not filter...

dnsmasq: Broken ECS source validation bypass

A validation bypass was discovered in dnsmasq's RFC 7871 client subnet ECS handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely...

dnsmasq security update

2.79-36 - Prevent overflow in extractname function CVE-2026-2291 - Prevent DoS in DNSSEC validation CVE-2026-4890 - Prevent out-of-bounds read in DNSSEC validation CVE-2026-4891 - Prevent out-of-bounds write in DHCPv6 server CVE-2026-4892 - Prevent source check avoidance by RFC 7871 client-subnet...

OESA-2026-2438 dnsmasq security update

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portabl...

dnsmasq: Broken ECS source validation bypass

A validation bypass was discovered in dnsmasq's RFC 7871 client subnet ECS handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely...

dnsmasq: Broken ECS source validation bypass

A validation bypass was discovered in dnsmasq's RFC 7871 client subnet ECS handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely...

SUSE 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-2026-4893

A validation bypass was discovered in dnsmasq's RFC 7871 client subnet ECS handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely...

EUVD-2026-29155

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-2026-4893

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

ALPINE-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-2026-4893

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-2026-4893 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-2026-4893

CVE-2026-4893 is an information-disclosure vulnerability in dnsmasq. A crafted DNS packet containing RFC 7871 client-subnet information allows remote attackers to bypass source checks. Affected component: dnsmasq’s DNS handling. Underlying impact per sources is information disclosure; exploitatio...

CVE-2026-4893 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-2026-4893

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

UBUNTU-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...

PT-2026-39701

Name of the Vulnerable Software and Affected Versions dnsmasq affected versions not specified Description An information disclosure issue allows remote attackers to bypass source checks by using a crafted DNS packet containing RFC 7871 client subnet information. Recommendations At the moment, the...