PT-2026-55611 · Microsoft · Edge

Sangnt · Published 2026-07-03 · Updated 2026-07-04 · CVE-2026-56645

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Microsoft Edge (Chromium-based) (affected versions not specified)

Description A heap-based buffer overflow occurs when a program writes more data to a heap memory block than it can hold, potentially corrupting memory. This flaw allows an unauthorized attacker to execute arbitrary code remotely over a network by sending crafted input. The attack does not require prior authentication.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-56645

Affected Products

Edge

References · 3

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56645 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56645 · Security Note
• https://reddit.com/r/pwnhub/comments/1unfdtr/critical_microsoft_edge_vulnerability_exposes · Reddit Post