Medium [CVE-2026-48045] Unauthenticated network attacker can cause Denial of Service
This medium-severity Red Hat Linux advisory covers CVE-2026-48045 affecting Red Hat OpenShift Container Platform 4, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1.
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Summary
Zeroconf is a pure Python implementation of multicast DNS service discovery.
Prior to 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_ABSOLUTE = 8966 bytes, in self._deferred[addr] and armed a per-address timer in self._timers[addr] without capping the per-address list or distinct addr keys, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to spoof sources, grow _deferred and _timers, and cause memory exhaustion and quadratic CPU burn.
This issue is fixed in version 0.149.12. A flaw was found in zeroconf, a Python library for network service discovery.
This vulnerability allows an unauthenticated attacker on the local network to send specially crafted queries. These queries can cause the system to retain large amounts of data and trigger excessive processing, leading to a denial of service (DoS) due to memory exhaustion and high CPU usage.
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. Red Hat's CVSS score matches the vendor/CVE.org assessment for this flaw.
Affected products named by the 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.
- < 0.149.12
- < 224.0.0.251
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Upgrade to zeroconf 0.149.12 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.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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