CVE-2026-41511 json
OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle
published 2026-04-22 6 mo ago modified 2026-10-26 13 d ago also GHSA-jxpf-xq2m-q525 , EUVD-2026-28813
- cvss
- 6.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
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.
Patch / fix
- nuget OpenMcdf 3.1.3
- openmcdf openmcdf 3.1.3
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | OpenMcdf | <3.1.3 |
3.1.3 |
Affected products
- ironfede openmcdf
Classification
- Weakness
-
- CWE-835 Loop with Unreachable Exit Condition
References
-
github.com
/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0
web, patch
-
github.com
/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525
exploit, web, vendor-advisory
-
github.com
/openmcdf/openmcdf/releases/tag/v3.1.3
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-41511
advisory
-
github.com
/openmcdf/openmcdf
package
Sources
- CVE List CVE-2026-41511
- GitHub Advisory GHSA-jxpf-xq2m-q525
- NVD CVE-2026-41511
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