File-existence probing via unchecked notebook entry paths
Published Jul 20, 2026 · Updated Jul 20, 2026
Path traversal in onenote_parser before 1.1.1 allows attackers to probe files or interrupt service through a crafted .onetoc2 file. Parser::parse_notebook joins untrusted table-of-contents entry names to the notebook base directory without rejecting absolute or parent paths, then opens the resolved files. Exploitation requires a consuming application to parse an attacker-supplied notebook; invalid sections block direct content return, while large or special targets can hang or crash the process and path outcomes reveal file existence.
Summary
What happened
Path traversal in onenote_parser before 1.1.1 allows attackers to probe files or interrupt service through a crafted .onetoc2 file. Parser::parse_notebook joins untrusted table-of-contents entry names to the notebook base directory without rejecting absolute or parent paths, then opens the resolved files. Exploitation requires a consuming application to parse an attacker-supplied notebook; invalid sections block direct content return, while large or special targets can hang or crash the process and path outcomes reveal file existence.
The record
- CVE
- CVE-2026-46671
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- Markus Siemens
- Product
- onenote_parser
- Classifications
- CWE-22, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 1.1.1
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What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Technologies
Your stack
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Your stack
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