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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-14586

CVE-2026-14586: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityMedium5.9

    Medium [CVE-2026-14586] Denial of Service via assertion failure in DNS-over-QUIC environments

    CVE-2026-14586Source published Source updated

    In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, in DNS-over-QUIC environments, with high concurrency and under pressure, an assertion in libngtcp2 about monotonic timestamps could trigger and result in server termination and thus denial of service. When interfacing with libngtcp2, for DNS-over-QUIC support in Unbound, it is expected to use monotonic time. Unbound was using realtime instead, and in DoQ environments with high concurrency and under pressure, an assert in libngtcp2 for the quic timestamp would trigger and terminate the server. This vulnerability needs Unbound to be compiled with DoQ support ('--with-libngtcp2') and the 'quic-port' to be configured for the listening interfaces. Under heavy DNS-over-QUIC (DoQ) traffic, a timing discrepancy in Unbound’s libngtcp2…

    Affected products in this advisory
    • Red Hat Hardened Images
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 9
    • Red Hat OpenShift Container Platform 4

    1 more entries in the full advisory.

    Source-reported affected versions
    • 1.22.0
    • 1.25.1
    Source-reported fixed versions
    • unbound-main-1.25.2-0.1.hum1
    • RHSA-2026:43588
    Mitigation guidance
    • Disable DNS-over-QUIC (DoQ) by removing or commenting out any quic-port directives in your unbound.conf file. Restart the unbound service for the changes to take effect and prevent potential assertion crashes.
    Full advisory and evidenceOpen source bulletin

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