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    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.

    Published:May 9, 2026
    Last Modified:May 12, 2026
    EPS:May 11, 2026
    EPSS Score:0.00054
    CVSS Score:5.3

    Affected Products

    Vendor
    Dnsmasq
    Product
    Dnsmasq

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-12969 (CVSS 5.3) — An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS …
    CVE-2026-12725 (CVSS 5.9) — A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and query logging are both enabled, …
    CVE-2026-4892 (CVSS 8.4) — A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers …
    CVE-2026-2291 (CVSS 7.3) — dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject…
    CVE-2026-5172 (CVSS 7.3) — A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds…
    CVE-2026-4893 (CVSS 5.3) — An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a craft…
    CVE-2026-4890 (CVSS 7.5) — A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a…
    CVE-2020-37127 (CVSS 6.9) — Dnsmasq-utils 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility that allows attacker…
    CVE-2025-12200 (CVSS 3.3) — ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its C…
    CVE-2025-12199 (CVSS 3.3) — ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its C…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High