CVE-2026-47180

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{"bugzilla": {"description": "zeroconf: Zeroconf: Denial of Service via crafted mDNS packets", "id": "2501850", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501850"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["A flaw was found in Zeroconf, a Python implementation of multicast DNS service discovery. An unauthenticated attacker on the local network can send a specially crafted multicast DNS (mDNS) packet with chained pointers. This can trigger a recursion error, leading to sustained CPU usage, excessive logging, and degraded mDNS services, ultimately causing a Denial of Service."], "mitigation": {"lang": "en:us", "value": "Upgrade to zeroconf 0.149.5 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."}, "name": "CVE-2026-47180", "public_date": "2026-07-17T18:21:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47180\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47180\nhttps://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cf\nhttps://github.com/python-zeroconf/python-zeroconf/pull/1719\nhttps://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.5\nhttps://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9pgc-3ccv-5297"], "statement": "Zeroconf is a pure Python implementation of multicast DNS (mDNS) service discovery. Prior to 0.149.5, a single mDNS packet carrying chained DNS-name compression pointers can trigger unbounded recursion in the label decoder, raising a RecursionError that escapes the packet parser and causes sustained CPU burn and log flooding, resulting in denial of service impact for unauthenticated hosts on the local network segment (UDP/5353, 224.0.0.251 / ff02::fb). Exploitation requires the attacker to be on the same local link as the affected host, consistent with Red Hat's Adjacent (AV:A) attack vector scoring. This issue is fixed upstream in zeroconf 0.149.5.\nRed Hat's CVSS score matches the vendor/CVE.org assessment for this flaw. This flaw is one of a batch of related Zeroconf issues discovered and fixed close together (CVE-2026-47180, CVE-2026-47183, CVE-2026-47184, CVE-2026-48045, CVE-2026-48487); all affect the same Red Hat product streams in the same way and were triaged consistently as a batch.", "threat_severity": "Moderate"}

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