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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-47184

CVE-2026-47184: 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 severityMedium6.5

    Medium [CVE-2026-47184] Denial of Service via uncontrolled memory growth

    CVE-2026-47184Source published Source updated

    Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.7, DNSCache._async_add inserted every response record into cache, _expirations, _expire_heap, and service_cache without a cap, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to multicast valid mDNS responses with unique names and cause memory exhaustion, slower cache lookups, slower async_expire passes, and broken discovery, registration, and ServiceBrowser callbacks. This issue is fixed in version 0.149.7. An unauthenticated attacker on the local network can send specially crafted multicast DNS responses. This can lead to uncontrolled memory growth, causing memory exhaustion and significantly degrading the performance of the service, ultimately resulting…

    Affected products in this advisory
    • Red Hat OpenShift Container Platform 4
    • Red Hat OpenStack Platform 16.2
    • Red Hat OpenStack Platform 17.1
    • Red Hat OpenStack Platform 18.0
    Source-reported affected versions
    • < 0.149.7
    • < 224.0.0.251
    Source-reported fixed versions
    • 0.149.7
    Mitigation guidance
    • Upgrade to zeroconf 0.149.7 or later once packaged in the affected Red Hat product. Where upgrading isn't immediately possible, restricting the affected host's exposure to the local network segment (network segmentation or firewalling multicast DNS traffic on UDP/5353) reduces the practical attack surface, since exploitation requires local-link access.
    Full advisory and evidenceOpen source bulletin

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