CVE-2026-41511

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

• 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

Published

May 8, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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