Is CVE-2026-41511 actively exploited?

No active exploitation of CVE-2026-41511 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-41511 be exploited remotely?

No. CVE-2026-41511 requires local access to exploit.

What is the CVSS score of CVE-2026-41511?

CVE-2026-41511 has a CVSS score of 6.2 (MEDIUM).

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MEDIUM

CVE-2026-41511

CWE-835Published: May 8, 2026· Updated: May 13, 2026

6.2

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.7th

Official Description

OpenMcdf is a fully .NET / C# library to manipulate Compound File Binary File Format files, also known as Structured Storage. Prior to version 3.1.3, OpenMcdf does not detect cycles in the directory entry red-black tree of a Compound File Binary (CFB) document. A crafted CFB file with a cycle in the LeftSiblingID / RightSiblingID chain causes Storage.EnumerateEntries() and Storage.OpenStream() to loop indefinitely, consuming the calling thread with no possibility of recovery via try/catch. This issue has been patched in version 3.1.3.

NVD Source

Technical Analysis

CVE-2026-41511 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.2.