CVE-2026-48045

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 86% 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: epss, secondary
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 is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_ABSOLUTE = 8966 bytes, in self._deferred[addr] and armed a per-address timer in self._timers[addr] without capping the per-address list or distinct addr keys, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to spoof sources, grow _deferred and _timers, and cause memory exhaustion and quadratic CPU burn. This issue is fixed in version 0.149.12.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
13.9%
KEV
Not listed

Published

June 11, 2026

Last Modified

July 17, 2026

Advisory Details (4)

Auto-updated Jul 17, 2026
Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available

0.149.12

Patch available: python-zeroconf/python-zeroconf 0.149.12

https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.12
github_commit Patch Available

commit b22c8ff19c66 (python-zeroconf/python-zeroconf)

Patch available: python-zeroconf/python-zeroconf 0.149.12 (contains commit b22c8ff19c66)

https://github.com/python-zeroconf/python-zeroconf/commit/b22c8ff19c66c68907d220a4823c0950f4fa93f7
github_pr Patch Available

fix: bound TC-deferred queues against spoofed-source flood OOM

Patch available: python-zeroconf/python-zeroconf 0.149.12 (PR #1751 merged 2026-05-20)

https://github.com/python-zeroconf/python-zeroconf/pull/1751
github Patch Available

Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood · Advisory · python-zeroconf/python-zeroconf · GitHub

https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9663-mqmp-p9mm

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—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 6× 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. 2026-07-23 03:18 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-06-14 23:18 UTCEPSS rescore
  8. 2026-06-13 23:00 UTCEPSS rescore
  9. 2026-06-12 23:12 UTCEPSS rescore
  10. 2026-06-11 13:56 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48045?
CVE-2026-48045 is a medium vulnerability published on June 11, 2026. Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.12, AsyncListener.handlequeryordefer retained every truncated TC-bit incoming query, each up to MAXMSGABSOLUTE = 8966 bytes, in self.deferred[addr] and armed a per-address timer in self.timers[addr] without…
When was CVE-2026-48045 disclosed?
CVE-2026-48045 was first published in the National Vulnerability Database on June 11, 2026, with the most recent update on July 17, 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 13.9% 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 v3 base score of 6.5 (NVD).
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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