TI-2026-30094 Aliases CVE-2026-41511 GHSA-jxpf-xq2m-q525

OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle

MEDIUM 61CWE-835Published 2026-05-08 · Updated 2026-05-11

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-835.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00187 8th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed openmcdf (ironfede): 3.1.3OpenMcdf (NuGet): 3.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ironfede	openmcdf	before 3.1.3	3.1.3	Patch available	CNA
—	OpenMcdf (NuGet)	before 3.1.3	3.1.3	Patch available	GHSA-jxpf-xq2m-q525

openmcdf Vendorironfede Affected before 3.1.3 Fixed in 3.1.3 Patch available CNA
OpenMcdf (NuGet) Vendor— Affected before 3.1.3 Fixed in 3.1.3 Patch available GHSA-jxpf-xq2m-q525

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openmcdf:openmcdf::::::::	before 3.1.3	Vulnerable	openmcdf

cpe:2.3:a:openmcdf:openmcdf:*:*:*:*:*:*:*:* Versions before 3.1.3 Vulnerable ·openmcdf

Remediation

Fix · CNA openmcdf (ironfede) Fixed in 3.1.3
Fix · GHSA-jxpf-xq2m-q525 OpenMcdf (NuGet) Fixed in 3.1.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-41511
2026-10-03 Alias added: GHSA-jxpf-xq2m-q525

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences