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CVE-2026-47183

📛 CVE Title

(no title)

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Description

zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion

Overview

State
—
Assigner (CNA)
—
CVSS severity
medium
CVSS score
CVSS 6.5 / 10 6.5 6.5 / 10
CVSS vector
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score
6.5 / 10 MEDIUM source: CNA overview
CWE(s)
—
Reserved
—
Published
—
Last updated
—
Source
https://www.tenable.com/cve/CVE-2026-47183

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-07-17 19:17:15 UTC
NVD last modified
2026-07-23 16:13:02 UTC
NVD CVSS v3.1
CVSS 6.5 / 10 6.5 6.5 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
2.8 / 10
Impact subscore
3.6 / 10
EPSS score
0.0024 (probability of exploitation in next 30 days)
EPSS percentile
15.44% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD-assigned CWE(s): CWE-400 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-08-01 16:28 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-45248
Assigner
GitHub_M
Published
Jul 17, 2026, 6:22:59 PM
Updated
Jul 17, 2026, 11:15:36 PM
EUVD base score (CVSS 3.1)
6.5 / 10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EUVD-reported EPSS
0.2400
Vendors
python-zeroconf
Products
python-zeroconf (< 0.149.6)
Aliases
GHSA-phvx-9mgw-67r5, PYSEC-2026-3437

ENISA 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.

EUVD references (5)

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (2)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (10)

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-47183.json.

Not stored.