CVE-2026-48045

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 95% 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.

python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood

Impact

AsyncListener.handle_query_or_defer retained every truncated (TC-bit) incoming query in self._deferred[addr] and armed a per-addr timer in self._timers[addr] that flushed the reassembled query within ~500 ms (RFC 6762 §18.5). Neither the per-addr list nor the number of distinct addr keys was capped, and the dedup check (for incoming in reversed(deferred): if incoming.data == msg.data) ran O(N) over the per-addr list on every arrival.

Any unauthenticated host on the local link (UDP/5353, 224.0.0.251 / ff02::fb) can stream byte-distinct TC-flagged mDNS queries — each up to _MAX_MSG_ABSOLUTE = 8966 bytes, with DNSIncoming retaining the raw data buffer plus parsed-record state. Trivially spoofed source IPs multiply the effect across _deferred / _timers, and the O(N) data compare burns CPU quadratically as each per-addr queue grows. On memory-constrained deployments (Home Assistant on Raspberry-Pi-class hardware is the canonical victim) sustained traffic OOM-kills the process; under lighter load, the per-arrival scan and event-loop scheduler starvation break unrelated zeroconf consumers (discovery, registration, ServiceBrowser callbacks).

Patches

Fixed in zeroconf 0.149.12 (PR #1751). Upgrade to >= 0.149.12.

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
5.0%
KEV
Not listed

Published

June 11, 2026

Last Modified

June 11, 2026

Vendor Advisories for CVE-2026-48045(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 (258 versions)0.149.12—

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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. 2026-07-07 03:10 UTCEG score recompute
  2. 2026-07-05 12:15 UTCEG score recompute
  3. 2026-07-04 11:26 UTCEG score recompute
  4. 2026-07-03 10:01 UTCEG score recompute
  5. 2026-07-02 09:12 UTCEG score recompute
  6. 2026-07-01 08:19 UTCEG score recompute
  7. 2026-06-30 07:32 UTCEG score recompute
  8. 2026-06-29 06:44 UTCEG score recompute
  9. 2026-06-28 04:52 UTCEG score recompute
  10. 2026-06-27 04:05 UTCEG score recompute
  11. 2026-06-26 03:16 UTCEG score recompute
  12. 2026-06-25 02:29 UTCEG score recompute
  13. 2026-06-24 01:41 UTCEG score recompute
  14. 2026-06-23 00:53 UTCEG score recompute
  15. 2026-06-22 00:05 UTCEG score recompute
  16. 2026-06-20 21:14 UTCEG score recompute
  17. 2026-06-19 20:27 UTCEG score recompute
  18. 2026-06-18 19:39 UTCEG score recompute
  19. 2026-06-17 18:49 UTCEG score recompute
  20. 2026-06-16 18:02 UTCEG score recompute
  21. 2026-06-15 17:15 UTCEG score recompute
  22. 2026-06-14 23:18 UTCEPSS rescore
  23. 2026-06-14 16:25 UTCEG score recompute
  24. 2026-06-13 23:00 UTCEPSS rescore
  25. 2026-06-13 15:38 UTCEG score recompute
Show 3 more
  1. 2026-06-12 23:12 UTCEPSS rescore
  2. 2026-06-12 14:43 UTCEG score recompute
  3. 2026-06-11 13:56 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-48045?
CVE-2026-48045 is a medium vulnerability published on June 11, 2026. python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood Impact AsyncListener.handlequeryordefer retained every truncated (TC-bit) incoming query in self.deferred[addr] and armed a per-addr timer in self._timers[addr] that flushed the reassembled…
When was CVE-2026-48045 disclosed?
CVE-2026-48045 was first published in the National Vulnerability Database on June 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48045 actively exploited?
CVE-2026-48045 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48045?
CVE-2026-48045 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-2026-48045?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48045, 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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