VDB
CVE-2026-47183
CVE-2026-47183
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published July 17, 2026
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.
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| python-zeroconf | python-zeroconf | < 0.149.6 |
| PyPI | zeroconf | 0 |
| python-zeroconf | python-zeroconf | < 0.149.6 |
Timeline
- May 29, 2026 CVE Published
- Jun 1, 2026 Security Advisory
- Jul 18, 2026 EPSS Score
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 4, 2026 EPSS Score
References
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5 x_refsource_CONFIRM
- https://github.com/python-zeroconf/python-zeroconf/issues/1714 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/pull/1717 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-47183 advisory
- https://github.com/advisories/GHSA-phvx-9mgw-67r5 advisory