CVE-2026-47183CWE-400denial-of-service

CVE-2026-47183

Medium · published July 17, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
31.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00389 · 31.8th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-07-17T23:17Z
Affected products (1)
ProductVersionsFixed in
paulsm/zeroconf< 0.149.60.149.6
References (5)
https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec · [email protected]https://github.com/python-zeroconf/python-zeroconf/issues/1714 · [email protected]https://github.com/python-zeroconf/python-zeroconf/pull/1717 · [email protected]https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6 · [email protected]https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5 · [email protected]
EPSS history
Timeline
  • 17 JUL 18:22Z
    Zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion
    cvelistv5