CVE-2026-47183

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.0%, top 94% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m, epss
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

Impact

DNSIncoming._log_exception_debug and the four QuietLogger exception-dedup methods stored an unbounded _seen_logs dict keyed by str(sys.exc_info()[1]). The seven IncomingDecodeError messages raised from _read_name / _decode_labels_at_offset (RFC 6762 §18 name-decoding error paths) all embed self.source — the peer's ephemeral source port, varying per packet — plus byte offset and pointer link, so every attacker-influenced combination produced a fresh dedup key. The stored value was the full sys.exc_info() triple, whose traceback's frame locals retained self.data (the raw inbound packet, up to 8966 bytes per RFC 6762 §17). Each unique malformed packet therefore pinned ~9 KB until process exit.

Any unauthenticated host on the local link (UDP/5353, 224.0.0.251 / ff02::fb) can drive memory growth at line rate; that includes a guest on the same Wi-Fi, a compromised IoT device, or a container on a shared bridge. On memory-constrained deployments (Home Assistant on Raspberry-Pi-class hardware is the canonical victim) sustained traffic trivially OOM-kills the process, and mDNS-dependent features (HomeKit, Chromecast/Matter, AirPlay, printers) degrade or fail.

Patches

Fixed in zeroconf 0.149.6 (PR #1717). Upgrade to >= 0.149.6.

Workarounds

There is no in-process workaround; upgrading is the fix. Otherwise, restrict mDNS (UDP/5353) to trusted Layer-2 segments via AP client isolation, guest-network separation, or host firewall rules.

Resources

CVSS v3
6.5
EG Score
6.5(low)
EPSS
5.7%
KEV
Not listed

Published

May 29, 2026

Last Modified

May 29, 2026

Vendor Advisories for CVE-2026-47183(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
zeroconf0.100.0 ... 0.99.0 (252 versions)0.149.6—

Data Freshness Timeline

(refreshed 3× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 01:48 UTCEG score recompute
  2. 2026-07-14 13:53 UTCEG score recompute
  3. 2026-07-11 17:23 UTCEG score recompute
  4. 2026-07-08 17:15 UTCEG score recompute
  5. 2026-07-02 03:46 UTCEG score recompute
  6. 2026-07-01 01:17 UTCEG score recompute
  7. 2026-06-29 21:09 UTCEG score recompute
  8. 2026-06-28 22:34 UTCEG score recompute
  9. 2026-06-27 23:59 UTCEG score recompute
  10. 2026-06-27 01:23 UTCEG score recompute
  11. 2026-06-26 01:49 UTCEG score recompute
  12. 2026-06-25 01:23 UTCEG score recompute
  13. 2026-06-24 02:48 UTCEG score recompute
  14. 2026-06-18 22:21 UTCEG score recompute
  15. 2026-06-17 23:35 UTCEG score recompute
  16. 2026-06-17 00:40 UTCEG score recompute
  17. 2026-06-16 02:05 UTCEG score recompute
  18. 2026-06-15 03:29 UTCEG score recompute
  19. 2026-06-14 23:18 UTCEPSS rescore
  20. 2026-06-14 04:54 UTCEG score recompute
  21. 2026-06-13 23:00 UTCEPSS rescore
  22. 2026-06-13 06:19 UTCEG score recompute
  23. 2026-06-12 23:12 UTCEPSS rescore
  24. 2026-06-12 07:43 UTCEG score recompute
  25. 2026-06-11 09:08 UTCEG score recompute
Show 12 more
  1. 2026-06-10 10:33 UTCEG score recompute
  2. 2026-06-09 11:58 UTCEG score recompute
  3. 2026-06-08 13:22 UTCEG score recompute
  4. 2026-06-07 14:48 UTCEG score recompute
  5. 2026-06-06 16:13 UTCEG score recompute
  6. 2026-06-05 17:37 UTCEG score recompute
  7. 2026-06-04 19:02 UTCEG score recompute
  8. 2026-06-03 20:27 UTCEG score recompute
  9. 2026-06-02 21:52 UTCEG score recompute
  10. 2026-06-01 23:16 UTCEG score recompute
  11. 2026-06-01 00:41 UTCEG score recompute
  12. 2026-05-29 20:20 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-47183?
CVE-2026-47183 is a medium vulnerability published on May 29, 2026. zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion Impact DNSIncoming.logexceptiondebug and the four QuietLogger exception-dedup methods stored an unbounded seenlogs dict keyed by str(sys.excinfo()[1]). The seven…
When was CVE-2026-47183 disclosed?
CVE-2026-47183 was first published in the National Vulnerability Database on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47183 actively exploited?
CVE-2026-47183 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47183?
CVE-2026-47183 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-47183?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47183, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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