CVEvulnerability
CVE-2026-47183
6.5 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-17
- Last modified
- 2026-08-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400
Description
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.
Affected configurations
• paulsm zeroconf (< 0.149.6)
Related
Weakness · CWE (1)
- CWE-400 Uncontrolled Resource Consumption weakness
References
- https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec Patch
- https://github.com/python-zeroconf/python-zeroconf/issues/1714 Issue Tracking, Patch
- https://github.com/python-zeroconf/python-zeroconf/pull/1717 Issue Tracking, Patch
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6 Release Notes
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5 Vendor Advisory, Patch