dnsmasq: DHCPv6 CLID buffer overflow in helper process

A heap buffer overflow was discovered in dnsmasq's DHCP script helper process. When processing DHCPv6 client identifiers CLIDs, the helper hex-encodes the raw CLID bytes into a fixed-size buffer without length validation. Since DHCPv6 CLIDs can be up to 65,535 bytes, a crafted DHCPv6 packet can...

RHEL 8 : dnsmasq (RHSA-2026:20589)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:20589 advisory. The dnsmasq packages contain Dnsmasq, a lightweight DNS Domain Name Server forwarder and DHCP Dynamic Host Configuration Protocol server...

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...

[SECURITY] Fedora 43 Update: dnsmasq-2.92rel2-2.fc43

Dnsmasq is lightweight, easy to configure DNS forwarder and DHCP server. It is designed to provide DNS and, optionally, DHCP, to a small network. It can serve the names of local machines which are not in the global DNS. The DHCP server integrates with the DNS server and allows machines with...

lwip-2026-pocs

lwip-2026-pocs Proof-of-concept exploits from the xchglabs...

CVE-2026-45158

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configured interface, which is processed by a shell script, allowing remote code execution as root on the underlying operating system. This vulnerability i...

CVE-2026-45158

CVE-2026-45158 affects OPNsense (FreeBSD-based firewall) prior to version 26.1.8. Unsanitized user input is passed to the DHCP configuration of the configured interface and processed by a shell script, enabling remote code execution as root on the underlying OS. The issue is fixed in 26.1.8. No e...

CVE-2026-45158 OPNsense: Command Injection via Attacker-Controlled DHCP Config

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configured interface, which is processed by a shell script, allowing remote code execution as root on the underlying operating system. This vulnerability i...

EUVD-2026-29290

barebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within the dhcpmessagetype function that fails to verify the options pointer remains within received packet bounds. An attacker on the same broadcast domain can send a crafted DHCP Offer or ACK...

CVE-2026-34960

barebox before 2026.04.0 contains an out-of-bounds read in DHCP option parsing (dhcp_message_type) due to not ensuring the options pointer stays within packet bounds. An attacker on the same broadcast domain can send a crafted DHCP Offer/ACK lacking a proper 0xff end marker to cause the parser to...

EUVD-2026-29154

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-2026-4892 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-2026-4892 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-2026-4892 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...

DNSmasq 安全漏洞

DNSmasq is a DNS configuration tool developed by Simon Kelley individually. DNSmasq has a security vulnerability, which stems from heap-based out-of-bound writes in the DHCPv6 implementation. This vulnerability allows local attackers to execute arbitrary code with root privileges using specially...

CLSA-2026-1778157268 dnsmasq: Fix of CVE-2022-0934

CVE-2022-0934: Fix write-after-free in DHCPv6 relay handling that could be triggered by a crafted packet, leading to denial of service - rfc3315: fix bad reply to DHCPCONFIRM messages wrong message type - rfc3315: fix integer underflow and heap overflow in log6opts STATUSCODE - rfc3315: fix...

CVE-2026-39849

Pi-hole FTL is the core engine of the Pi-hole network-level advertisement and tracker blocker. In versions before 6.6.1, the dns.interface configuration field in Pi-hole FTL accepted newline characters without validation, allowing an attacker to inject arbitrary directives into the generated...

SUSE CVE-2026-29004

BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client udhcpc6 DNSSERVERS option handler in networking/udhcp/d6dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6OPTDNSSERVER...

CVE-2026-39849 Pi-hole FTL remote code execution via newline injection in dns.interface configuration

Pi-hole FTL is the core engine of the Pi-hole network-level advertisement and tracker blocker. In versions before 6.6.1, the dns.interface configuration field in Pi-hole FTL accepted newline characters without validation, allowing an attacker to inject arbitrary directives into the generated...

CVE-2026-29004

BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client udhcpc6 DNSSERVERS option handler in networking/udhcp/d6dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6OPTDNSSERVER...