CVE-2026-22810

Joplin: Path traversal in OneNote importer allows overwriting arbitrary files

CVSS 3.1 8.2 HIGHEUVD CVSS 3.1 8.2 CVSS 3.1 · [email protected] · Secondary 8.2 HIGHCVSS 3.1 · [email protected] · Primary 7.3 HIGHCVSS_V3 Publisher rating HIGHFixed by @joplin/onenote-converter 3.5.7KEV status unknown

Original advisory

cve-program · CVE-2026-22810

Published

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.

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euvd · EUVD-2026-30806

Published

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nvd · CVE-2026-22810

Published

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osv · GHSA-gcmj-c9gg-9vh6

Published

### Summary A path traversal vulnerability in the OneNote importer allows overwriting arbitrary files on disk. ### Details The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious `.one` file that includes file names containing `../../`, that are then interpreted as part of the target path when extracting attachments from the `.one` file. One affected location is `embedded_file.rs`, which generates a file name from a string previously parsed from the `.one` file, https://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L13-L16 Above, [`determine_filename`](https://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L56-L64) passes through the provided file name. [Similar logic](https://github.com/laurent22/joplin/blob/4d7fa5972fe2986eae14cbf3a2801835cbe1384e/packages/onenote-converter/src/page/embedded_file.rs#L14) has been present since 4d7fa5972fe2986eae14cbf3a2801835cbe1384e (Joplin 3.2.2), when the OneNote importer was first introduced. ### PoC [Screencast from 2025-11-20 13-50-21.webm](https://github.com/user-attachments/assets/a9d6cc64-ec11-4f33-9f92-32efe0eaab23) 1. Import [poc_v2.zip](https://github.com/user-attachments/files/23664109/poc_v2.zip). 2. Open the application's profile directory, then open `log.txt`. 3. Observe that `log.txt` has been overwritten non-log-file content (a WAV file). Tested on Fedora Linux 43 with Joplin 3.4.12 (prod, linux) and Joplin 3.5.6 (dev, linux). **Note**: The PoC ZIP file overwrites Joplin's `log.txt`. It is also possible to craft a file that overwrites more sensitive system files (e.g. `.bashrc` on Linux). ### Impact This is a path traversal vulnerability that impacts **all versions of Joplin (<= v3.5.6) that include a OneNote importer**. Importing a crafted OneNote export file allows an attacker to overwrite arbitrary files, potentially leading to remote code execution. ### Patched in - **Joplin**: https://github.com/laurent22/joplin/commit/791668455e1aae50501ff57ea4783b3fba9d377c - **one2html**: https://github.com/msiemens/one2html/commit/948d65cdca5bb35d776b8b235ec05ff15249fd41

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Affected versions, risk and source history

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Advisory history

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15 Nov 2026 07:35:30 UTC