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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-47183

CVE-2026-47183: 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-2026-47183] Denial of Service via unbounded memory growth from mDNS messages

    CVE-2026-47183Source published Source updated

    Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming._log_exception_debug and the four QuietLogger exception-dedup methods stored an unbounded _seen_logs dictionary keyed by attacker-influenced IncomingDecodeError messages, retaining sys.exc_info() tracebacks whose frame locals kept raw packet self.data buffers and allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to drive memory growth until mDNS-dependent features degrade or the process is OOM-killed. This issue is fixed in version 0.149.6. An unauthenticated attacker on the local network can send specially crafted mDNS messages, causing the system to store an unbounded number of error messages. This can lead to excessive memory consumption…

    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
    • < 0.149.6
    • < 224.0.0.251
    Source-reported fixed versions
    • 0.149.6
    Mitigation guidance
    • Upgrade to zeroconf 0.149.6 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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