CVE-2026-40210

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-06-25. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.8Exploit: NoneExposed: 0

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

An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.

CVSS v3
4.8
EG Score
4.8(high)
EPSS
25.6%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 27, 2026
No patch confirmed yet.
generic

PowerDNS Security Advisory 2026-09 for DNSdist: Multiple issues - dnsdist documentation

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

Vendor Advisories for CVE-2026-40210(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 36× 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. 2026-07-06 21:20 UTCEG score recompute
  2. 2026-07-06 21:19 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 20:46 UTCEG score recompute
  8. 2026-07-05 20:45 UTCGHSA enrichment
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 20:15 UTCEG score recompute
  11. 2026-07-04 20:15 UTCGHSA enrichment
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 19:45 UTCEG score recompute
  14. 2026-07-03 19:45 UTCGHSA enrichment
  15. 2026-07-02 19:16 UTCEG score recompute
  16. 2026-07-02 19:16 UTCGHSA enrichment
  17. 2026-07-01 18:47 UTCEG score recompute
  18. 2026-07-01 18:47 UTCGHSA enrichment
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 18:18 UTCEG score recompute
  22. 2026-06-30 18:18 UTCGHSA enrichment
  23. 2026-06-29 17:48 UTCEG score recompute
  24. 2026-06-29 17:48 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 11 more
  1. 2026-06-28 17:17 UTCEG score recompute
  2. 2026-06-28 17:17 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-27 16:48 UTCEG score recompute
  6. 2026-06-27 16:48 UTCGHSA enrichment
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-26 16:18 UTCEG score recompute
  9. 2026-06-26 16:18 UTCGHSA enrichment
  10. 2026-06-25 15:50 UTCEG score recompute
  11. 2026-06-25 15:50 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-40210?
CVE-2026-40210 is a medium vulnerability published on June 25, 2026. An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.
When was CVE-2026-40210 disclosed?
CVE-2026-40210 was first published in the National Vulnerability Database on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40210 actively exploited?
CVE-2026-40210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40210?
CVE-2026-40210 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-40210?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40210, 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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