CVE•Published 2026-05-08•Modified 2026-06-05•0 articles on news•6 live references•NVD data

CVE-2026-41511Openmcdf · Openmcdf

Vulnerability data via NVD (ingested)

CVSS v3.1

6.2

MEDIUM

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

EPSS percentile

Exploit Prediction Scoring System · top 98% of all CVEs

Weaknesses (CWE)

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')

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.

Timeline

Published 2026-05-08

Modified 2026-06-05

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-41511

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Openmcdf Openmcdf"

All exposed Openmcdf Openmcdf instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Openmcdf"

HTTP body or banner mentions "Openmcdf" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-41511