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    CVE-2026-12725

    A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and query logging are both enabled, logging of DS or DNSKEY replies containing unsupported algorithm or digest types can cause dnsmasq to write past the end of an internal logging buffer. A remote attacker able to supply such a DNS response may crash the dnsmasq process, resulting in denial of service.

    Published:Jun 22, 2026
    Last Modified:Jun 24, 2026
    EPS:Jun 22, 2026
    EPSS Score:0.00406
    CVSS Score:5.9

    Affected Products

    Vendor
    Dnsmasq
    Product
    Dnsmasq
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    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-2026-4891 (CVSS 5.3) — A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to c…
    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 Reason: This candidate was withdrawn by its C…
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    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