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ALSA-2026:19158 — Important: dnsmasq security update

Affected: AlmaLinux:10: dnsmasq, AlmaLinux:10: dnsmasq-utils

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

* dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291) * dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890) * dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891) * dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892) * dnsmasq: Broken ECS source validation bypass (CVE-2026-4893) * dnsmasq: extract_addresses() OOB read via malformed rdlen (CVE-2026-5172)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

BELL-CVE-2026-4891

Affected: Alpaquita:23: dnsmasq, Alpaquita:25: dnsmasq, Alpaquita:stream: dnsmasq

certfr-2026-avi-0986 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquan…

certfr-2026-avi-0986

CLEANSTART-2026-BB03261 — Security fix for CVE-2026-4891 applied in: dnsmasq 2.92_p2-r0

Affected: CleanStart: dnsmasq

Security vulnerability affects the dnsmasq package. This issue is resolved in later releases. See references for vulnerability details.

EUVD-2026-362248

fkie_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.

GHSA-2qp9-xr4x-2cr9

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.

msrc_CVE-2026-4891 — CVE-2026-4891

msrc_CVE-2026-4891

OESA-2026-2435 — dnsmasq security update

Affected: openEuler:24.03-LTS: dnsmasq

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 portable hotspots, and to support virtual networking in virtualisation frameworks. Security Fix(es):

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-2026-2291)

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-2026-4890)

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-2026-4891)

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)

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 buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read an…

openSUSE-SU-2026:10821-1 — dnsmasq-2.92rel2-1.1 on GA media

dnsmasq-2.92rel2-1.1 on GA media

RHSA-2026:40762 — Red Hat Security Advisory: OpenShift Container Platform 4.19.39 bug fix and security update

dnsmasq: NSEC bitmap parsing infinite loop dnsmasq: RRSIG rdlen underflow leading to heap OOB read dnsmasq: DHCPv6 CLID buffer overflow in helper process dnsmasq: Broken ECS source validation bypass gnutls: gnutls: Information disclosure via heap overread in RSA key exchange glibc: glibc: Heap Buffer Overflow in `scanf` with `%mc` format specifier and large width gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability gnutls: gnutls: Authentication Bypass via NUL Character in Username gnutls: gnutls: Security bypass due to incorrect name constraint handling gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name

RLSA-2026:19158 — Important: dnsmasq security update

Affected: Rocky Linux:10: dnsmasq

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

* dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)

* dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)

* dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)

* dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)

* dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

* dnsmasq: extract_addresses() OOB read via malformed rdlen (CVE-2026-5172)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:21640-1 — Security update for dnsmasq

Security update for dnsmasq

UBUNTU-CVE-2026-4891

Affected: Ubuntu:Pro:16.04:LTS: dnsmasq, Ubuntu:Pro:18.04:LTS: dnsmasq, Ubuntu:Pro:20.04:LTS: dnsmasq, Ubuntu:22.04:LTS: dnsmasq, Ubuntu:24.04:LTS: dnsmasq, Ubuntu:25.10: dnsmasq, Ubuntu:26.04:LTS: dnsmasq

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.

WID-SEC-W-2026-1468 — dnsmasq: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in dnsmasq ausnutzen, um einen Denial-of-Service-Zustand zu verursachen, beliebigen Code mit Root-Rechten auszuführen, vertrauliche Informationen offenzulegen, Daten zu manipulieren und Benutzer auf bösartige Domains umzuleiten