CVE-2026-69522

CVE-2026-69522 is a heap-based buffer overflow (CWE-122) in Microsoft Visual Studio that is reachable over a network without authentication. The CVSS vector requires user interaction (UI:R), indicating the flaw is triggered when a user handles attacker-influenced content, such as opening a crafted file or project in the IDE. Successful exploitation yields arbitrary code execution on the developer workstation with the privileges of the user running Visual Studio, with high impact to confidentiality, integrity, and availability. Any organization or developer running Visual Studio is potentially affected, though the available data does not specify which version ranges are vulnerable. As of this analysis there is no evidence of exploitation: the flaw is not in CISA's KEV, no public proof-of-concept is known, and EPSS assigns a low 0.8% probability of exploitation within 30 days.

What to do: Apply Microsoft's Visual Studio security update referenced in the advisory as soon as possible, and consult the advisory for the exact affected and fixed version ranges. Until patched, have developers avoid opening untrusted projects, files, or packages from unknown sources, since exploitation requires user interaction. No public PoC or in-the-wild exploitation is currently known, but monitor Microsoft's advisory for updates.