CVE-2026-47183

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{"bugzilla": {"description": "zeroconf: Zeroconf: Denial of Service via unbounded memory growth from mDNS messages", "id": "2501843", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501843"}, "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-770", "details": ["A flaw was found in zeroconf, a Python implementation of multicast DNS (mDNS) service discovery. 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, resulting in a denial of service (DoS) where mDNS-dependent features degrade or the process terminates unexpectedly."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-47183", "public_date": "2026-07-17T18:22:59Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47183\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47183\nhttps://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec\nhttps://github.com/python-zeroconf/python-zeroconf/issues/1714\nhttps://github.com/python-zeroconf/python-zeroconf/pull/1717\nhttps://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6\nhttps://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5"], "statement": "Zeroconf is a pure Python implementation of multicast DNS (mDNS) service discovery. Prior to 0.149.6, the exception-deduplication cache that tracks malformed-packet decode errors grows without bound, retaining full tracebacks (including raw packet buffers) keyed by attacker-influenced error messages, leading to unbounded memory growth, 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 0.149.6.\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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