CVE-2026-41511

Name: CVE-2026-41511
Creator: NVD / NIST
Published: 2026-05-08T19:16:31.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2026-41511 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.19%

8.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Openmcdf	Openmcdf	< 3.1.3

References

https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0Patch
https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3Release Notes
https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525Exploit, Vendor Advisory
https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525Exploit, Vendor Advisory

Timeline

Published: May 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-41511?

How severe is CVE-2026-41511?

CVE-2026-41511 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2026-41511?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41511?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST