Is CVE-2026-41511 in the CISA KEV catalog?

No. CVE-2026-41511 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2026-41511 has a CVSS v3 base score of 6.2 (MEDIUM).

What is the EPSS score for CVE-2026-41511?

CVE-2026-41511 has an EPSS score of 0.19% (8th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-41511?

Upgrade openmcdf to 3.1.3 or later.

CVE & CISA-KEV Catalog

CVE-2026-41511

MEDIUM

6.2

CVSS v3

NVD

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.

CWE-835

How to fix

Remediation Available

openmcdfNVD

Affected:< 3.1.3Fixed in:3.1.3CVE-2026-41511derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.19%probability of exploitation in 30 days

8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Release Notes1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-05.