{"id":"CVE-2026-41511","revision":null,"records":[{"revision":"5cddf5b74e5f48d5b0267f431b31f64d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-41511","aliases":[],"title":"OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle","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.","state":0,"publishedAt":"2026-05-08T18:52:39.438+00:00","modifiedAt":"2026-05-11T18:45:06.128+00:00","affected":[{"ecosystem":"Vendor product","name":"openmcdf","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"ironfede\",\n                    \"product\": \"openmcdf\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.1.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.2,"severity":"MEDIUM"}],"references":["https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525","https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0","https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-41511","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-41511","identifiers":["CVE-2026-41511"]},"retained":false,"historicalAffected":[]},{"revision":"a84472e2a0244f468244f6c457510ff0","observedAt":"2026-11-07T13:22:33.972+00:00","statement":{"source":"euvd","id":"EUVD-2026-28813","aliases":["CVE-2026-41511","GHSA-jxpf-xq2m-q525"],"title":"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 B…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.2,"severity":null}],"references":["https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525","https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0","https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28813","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 8, 2026, 6:52:39 PM","dateUpdated":"May 11, 2026, 6:45:06 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-28813","identifiers":["EUVD-2026-28813","CVE-2026-41511","GHSA-jxpf-xq2m-q525"]},"retained":false,"historicalAffected":[]},{"revision":"5b8e898e4579415ebc57c0f87737d952","observedAt":"2026-10-27T10:10:19.004+00:00","statement":{"source":"nvd","id":"CVE-2026-41511","aliases":[],"title":"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 B…","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.","state":0,"publishedAt":"2026-05-08T19:16:31.363+00:00","modifiedAt":"2026-10-26T18:10:00.173+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.2,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5,"severity":"MEDIUM"}],"references":["https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0","https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3","https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41511","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-835"],"productCriteria":["cpe:2.3:a:openmcdf:openmcdf:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-08T19:16:31.363","lastModified":"2026-10-26T18:10:00.173"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-41511","identifiers":["CVE-2026-41511"]},"retained":false,"historicalAffected":[]},{"revision":"5ed2cf359bb54e1c807ee404eaf0c687","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-jxpf-xq2m-q525","aliases":["CVE-2026-41511"],"title":"OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle","description":"### Summary\nOpenMcdf 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`.\n\n### Details\nCFB directory entries form a red-black tree linked by `LeftSiblingID` and `RightSiblingID` fields. OpenMcdf's `DirectoryTreeEnumerator` and `DirectoryTree.TryGetDirectoryEntry` traverse this tree without tracking visited node IDs, so a crafted cycle (e.g. entry A's `RightSiblingID` points to entry B, and entry B's `LeftSiblingID` points back to entry A) causes traversal to loop indefinitely.\n\nTwo distinct code paths are affected:\n\n- **`Storage.EnumerateEntries()`** - `DirectoryTreeEnumerator.MoveNext()` never returns `false`; the same entry is yielded on every iteration and the caller's `foreach` never exits. Heap grows unboundedly as entries accumulate.\n- **`Storage.OpenStream()`** - `DirectoryTree.TryGetDirectoryEntry` loops indefinitely inside `DirectoryEntries.TryGetSibling` during the name lookup.\n\n### PoC\nA crafted CFB file with a sibling cycle (see attached) triggers the issue with the following code:\n\n```csharp\nusing OpenMcdf;\n\nusing var ms = new MemoryStream(File.ReadAllBytes(\"crafted.cfb\"));\nusing var root = RootStorage.Open(ms);\n\n// Never returns - EnumerateEntries loops indefinitely\nforeach (var entry in root.EnumerateEntries())\n{\n    Console.WriteLine(entry.Name);\n\n    if (entry.Type == EntryType.Stream)\n        root.OpenStream(entry.Name); // also hangs depending on the cycle structure\n}\n```\n\n### Impact\nA denial of service affecting any application that opens untrusted CFB files with OpenMcdf. A small crafted input carrying a valid CFB magic header (`D0 CF 11 E0 A1 B1 1A E1`) is sufficient to pass initial format validation and reach the vulnerable traversal code. No exception is thrown, so `try/catch` cannot protect callers. The affected thread is unrecoverable without killing the process.","state":0,"publishedAt":"2026-04-22T22:09:01+00:00","modifiedAt":"2026-05-13T13:52:34.912355+00:00","affected":[{"ecosystem":"NuGet","name":"OpenMcdf","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.1.3"}]}],"versions":["1.5.4","1.5.4.1","1.5.4.22637","2.0.5739","2.0.5739.40493","2.1.0.33051","2.1.2.1274","2.1.3.34720","2.1.3.34730","2.1.4.23498","2.1.5.22659","2.1.6.28924","2.2.0.1","2.2.1.12","2.2.1.2","2.2.1.3","2.2.1.4","2.2.1.5","2.2.1.6","2.2.1.8","2.2.1.9","2.3.0","2.3.1","2.4.0","2.4.1","3.0.0","3.0.0-preview1","3.0.1","3.0.2","3.0.3","3.1.0","3.1.1","3.1.2"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525","https://nvd.nist.gov/vuln/detail/CVE-2026-41511","https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0","https://github.com/openmcdf/openmcdf","https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3"],"sourceUrl":"https://github.com/advisories/GHSA-jxpf-xq2m-q525","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-jxpf-xq2m-q525","identifiers":["GHSA-jxpf-xq2m-q525","CVE-2026-41511"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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