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Microsoft Edge Chromium Based CVE-2026-56645

| EUVDEUVD-2026-41646 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-07-03 microsoft GHSA-vqcc-q5p5-r9q5
8.8
CVSS 3.1 · Vendor: microsoft
Temporal: 7.7
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Severity by source

Vendor (microsoft) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CIRCL (temporal)
7.7 HIGH
cvss

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 03, 2026 - 21:06 vuln.today
CVE Published
Jul 03, 2026 - 20:35 cve.org
HIGH 8.8

DescriptionCVE.org

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

AnalysisAI

Remote code execution in Microsoft Edge (Chromium-based) stems from a heap-based buffer overflow (CWE-122) that a network attacker can trigger when a victim renders crafted web content. The CVSS 3.1 base score is 8.8 with a network vector requiring user interaction (UI:R), and Microsoft has released an official fix (RL:O). …

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24 hours: Issue security alert to all Edge users and restrict access to untrusted websites where feasible. …

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CVE-2026-56645 vulnerability details – vuln.today

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