CVE-2026-41511
MEDIUMOpenMcdf has an Infinite loop DoS via crafted CFB directory cycle
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525
X_Refsource_Misc x_refsource_misc
https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0
X_Refsource_Misc x_refsource_misc
https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3
Scores
CVSS v3
6.2
EPSS
0.0001
EPSS Percentile
3.6%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-835
Status
published
Products (2)
ironfede/openmcdf
< 3.1.3
nuget/OpenMcdf
0 - 3.1.3NuGet
Published
May 08, 2026
Tracked Since
May 09, 2026