Vulnerability in Ironfede Openmcdf
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (8.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Ironfede Openmcdf — versions < 3.1.3
- Openmcdf
- Openmcdf Project
Weakness classification (CWE)
References
- github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525 (Exploit, Vendor Advisory)
- github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0 (Patch)
- github.com/openmcdf/openmcdf/releases/tag/v3.1.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-41511?
- CVE-2026-41511 is a medium-severity vulnerability in Ironfede Openmcdf, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.2/10. Published 2026-05-08.
- How severe is CVE-2026-41511?
- Medium severity. CVSS v3 base score is 6.2 out of 10.