According to the versions of the dnsmasq packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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 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)

    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)

    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)

    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)

Tenable has extracted the preceding description block directly from the EulerOS dnsmasq security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:19158 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1729 advisory.

    A flow has been identified into dnssec.c library, causing an infinite loop to dnsmasq service. An attacker     who controls any DNSSEC-signed zone can hang the dnsmasq process with a single crafted response, killing     all DNS resolution for its clients. (CVE-2026-13002)

    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 and crash by exploiting a malformed DNS response, enabling extract_name() to advance the     pointer past the record's end. (CVE-2026-5172)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-19158 advisory.

    - Prevent overflow in extract_name 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 (CVE-2026-4893)
    - Prevent out-of-bounds read in extract_addresses (CVE-2026-5172)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the dnsmasq package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
332788	EulerOS 2.0 SP13 : dnsmasq (EulerOS-SA-2026-2963)	Nessus	Huawei Local Security Checks	2026/8/6	2026/8/6	high
332890	EulerOS 2.0 SP13 : dnsmasq (EulerOS-SA-2026-3013)	Nessus	Huawei Local Security Checks	2026/8/6	2026/8/6	high
315378	RHEL 10 : dnsmasq (RHSA-2026:19158)	Nessus	Red Hat Local Security Checks	2026/5/19	2026/5/28	high
316834	Amazon Linux 2023 : dnsmasq, dnsmasq-utils (ALAS2023-2026-1729)	Nessus	Amazon Linux Local Security Checks	2026/5/26	2026/8/25	high
327498	Oracle Linux 10 : dnsmasq (ELSA-2026-19158)	Nessus	Oracle Linux Local Security Checks	2026/7/17	2026/7/17	high
319598	Photon OS 5.0: Dnsmasq PHSA-2026-5.0-0866	Nessus	PhotonOS Local Security Checks	2026/6/6	2026/10/14	high
314274	Linux Distros Unpatched Vulnerability : CVE-2026-4890	Nessus	Misc.	2026/5/11	2026/10/16	high

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