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CVE-2026-47184
6.5 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Adjacent (A)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Adjacent (A)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created & dismissed (no matching packages found) suggestion
Zeroconf: Unbounded DNS record cache allows LAN-local memory exhaustion via multicast flood
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.
References
-
https://github.com/python-zeroconf/python-zeroconf/issues/1715 x_refsource_MISC
-
https://github.com/python-zeroconf/python-zeroconf/pull/1718 x_refsource_MISC
Affected products
python-zeroconf
- ==< 0.149.7