CVE-2026-56645

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.8Exploit: NoneExposed: 0

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

Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
8.8(high)
EPSS
43.0%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (1)

Auto-updated Jul 6, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56645

Vendor Advisories for CVE-2026-56645(1)

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

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

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

Frequently asked(5)

What is CVE-2026-56645?
CVE-2026-56645 is a high vulnerability published on July 3, 2026. Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
When was CVE-2026-56645 disclosed?
CVE-2026-56645 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56645 actively exploited?
CVE-2026-56645 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56645?
CVE-2026-56645 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-56645?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56645, 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

Explore the affected products and dependency analysis for CVE-2026-56645

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