CVSS 3.1
6.5 mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-47183
Medium (6.5) in paulsm zeroconf. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in zeroconf 0.149.6.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- paulsm:zeroconf
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-phvx-9mgw-67r5 | PyPI | zeroconf | <0.149.6 | 0.149.6 |
| PYSEC-2026-3437 | PyPI | zeroconf | <0.149.6 | 0.149.6 |
References
- https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec
- https://github.com/python-zeroconf/python-zeroconf/issues/1714
- https://github.com/python-zeroconf/python-zeroconf/pull/1717
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5