Vulnerability-Lookup

CVE-2026-46671 (GCVE-0-2026-46671)

Vulnerability from cvelistv5 – Published: 2026-07-20 15:56 – Updated: 2026-07-20 17:31

Title

Rust OneNote File Parser: Path traversal in `Parser::parse_notebook` allows reading files outside the notebook directory

Summary

Rust OneNote File Parser is a parser for Microsoft OneNote files implemented in Rust. Prior to version 1.1.1, a maliciously crafted `.onetoc2` table-of-contents file can cause `Parser::parse_notebook` to open arbitrary files on the host filesystem outside the notebook's directory. The parser reads entry names listed inside the `.onetoc2` and joins them against the notebook's base directory without validating that they are relative paths confined to that directory. The parser will bail out when the target file fails to parse as a OneNote section, so direct content exfiltration through the parser's return value is not practical, though file-existence probing and denial-of-service via large or special files remain possible. Anyone using `onenote_parser` to parse .onetoc2 files received from untrusted sources is affected. Users who only ever parse their own notebooks are not at meaningful risk. The issue is fixed in onenote_parser 1.1.1. The fix rejects absolute paths, parent-directory components, and other invalid path characters in entry names, and additionally canonicalises the resolved path to confirm it stays inside the notebook's base directory. For users who cannot upgrade to 1.1.1, only call `Parser::parse_notebook` on `.onetoc2` files from trusted sources. Alternatively, use `Parser::parse_section` / `Parser::parse_section_buffer` on individual .one files, which do not perform the directory walk.

Severity

4.4 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/msiemens/onenote.rs/security/a…	x_refsource_CONFIRM
https://github.com/msiemens/onenote.rs/commit/c92…	x_refsource_MISC
https://github.com/msiemens/onenote.rs/blob/maste…	x_refsource_MISC
https://github.com/msiemens/onenote.rs/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
msiemens	onenote.rs	Affected: < 1.1.1

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-46671",
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        }
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FKIE_CVE-2026-46671

Vulnerability from fkie_nvd - Published: 2026-07-20 16:17 - Updated: 2026-07-20 18:16

Severity

4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/msiemens/onenote.rs/blob/master/CHANGELOG.md#111---2026-05-15
	security-advisories@github.com	https://github.com/msiemens/onenote.rs/commit/c9267b2c96e2542be7e7b557d67318e81b733585
	security-advisories@github.com	https://github.com/msiemens/onenote.rs/releases/tag/v1.1.1
	security-advisories@github.com	https://github.com/msiemens/onenote.rs/security/advisories/GHSA-4j5m-wc25-pvh7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "onenote.rs",
          "vendor": "msiemens",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.1.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rust OneNote File Parser is a parser for Microsoft OneNote files implemented in Rust. Prior to version 1.1.1, a maliciously crafted `.onetoc2` table-of-contents file can cause `Parser::parse_notebook` to open arbitrary files on the host filesystem outside the notebook\u0027s directory. The parser reads entry names listed inside the `.onetoc2` and joins them against the notebook\u0027s base directory without validating that they are relative paths confined to that directory. The parser will bail out when the target file fails to parse as a OneNote section, so direct content exfiltration through the parser\u0027s return value is not practical, though file-existence probing and denial-of-service via large or special files remain possible. Anyone using `onenote_parser` to parse .onetoc2 files received from untrusted sources is affected. Users who only ever parse their own notebooks are not at meaningful risk. The issue is fixed in onenote_parser 1.1.1. The fix rejects absolute paths, parent-directory components, and other invalid path characters in entry names, and additionally canonicalises the resolved path to confirm it stays inside the notebook\u0027s base directory. For users who cannot upgrade to 1.1.1, only call `Parser::parse_notebook` on `.onetoc2` files from trusted sources. Alternatively, use `Parser::parse_section` / `Parser::parse_section_buffer` on individual .one files, which do not perform the directory walk."
    }
  ],
  "id": "CVE-2026-46671",
  "lastModified": "2026-07-20T18:16:52.833",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L",
          "version": "3.1"
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  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/msiemens/onenote.rs/blob/master/CHANGELOG.md#111---2026-05-15"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/msiemens/onenote.rs/commit/c9267b2c96e2542be7e7b557d67318e81b733585"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/msiemens/onenote.rs/releases/tag/v1.1.1"
    },
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      "source": "security-advisories@github.com",
      "url": "https://github.com/msiemens/onenote.rs/security/advisories/GHSA-4j5m-wc25-pvh7"
    }
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  "vulnStatus": "Received",
  "weaknesses": [
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        {
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          "value": "CWE-22"
        }
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      "type": "Secondary"
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  ]
}

GHSA-4J5M-WC25-PVH7

Vulnerability from github – Published: 2026-05-21 21:32 – Updated: 2026-05-21 21:32

Summary

Rust OneNote File Parser: Path traversal in `Parser::parse_notebook` allows reading files outside the notebook directory

Details

Impact

A maliciously crafted .onetoc2 table-of-contents file can cause Parser::parse_notebook to open arbitrary files on the host filesystem outside the notebook's directory. The parser reads entry names listed inside the .onetoc2 and joins them against the notebook's base directory without validating that they are relative paths confined to that directory.

The parser will bail out when the target file fails to parse as a OneNote section, so direct content exfiltration through the parser's return value is not practical, though file-existence probing and denial-of-service via large or special files remain possible.

Anyone using onenote_parser to parse .onetoc2 files received from untrusted sources is affected. Users who only ever parse their own notebooks are not at meaningful risk.

Patches

Fixed in onenote_parser 1.1.1. The fix rejects absolute paths, parent-directory components, and other invalid path characters in entry names, and additionally canonicalises the resolved path to confirm it stays inside the notebook's base directory.

Workarounds

For users who cannot upgrade to 1.1.1:

Only call Parser::parse_notebook on .onetoc2 files from trusted sources.
Alternatively, use Parser::parse_section / Parser::parse_section_buffer on individual .one files, which do not perform the directory walk.

Severity

4.4 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "onenote_parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46671"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-21T21:32:11Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nA maliciously crafted `.onetoc2` table-of-contents file can cause `Parser::parse_notebook` to open arbitrary files on the host filesystem outside the notebook\u0027s directory. The parser reads entry names listed inside the `.onetoc2` and joins them against the notebook\u0027s base directory without validating that they are relative paths confined to that directory.\n\nThe parser will bail out when the target file fails to parse as a OneNote section, so direct content exfiltration through the parser\u0027s return value is not practical, though file-existence probing and denial-of-service via large or special files remain possible.\n\nAnyone using `onenote_parser` to parse .onetoc2 files received from untrusted sources is affected. Users who only ever parse their own notebooks are not at meaningful risk.\n\n### Patches\nFixed in onenote_parser 1.1.1. The fix rejects absolute paths, parent-directory components, and other invalid path characters in entry names, and additionally canonicalises the resolved path to confirm it stays inside the notebook\u0027s base directory.\n\n### Workarounds\nFor users who cannot upgrade to 1.1.1:\n\n- Only call `Parser::parse_notebook` on `.onetoc2` files from trusted sources.\n- Alternatively, use `Parser::parse_section` / `Parser::parse_section_buffer` on individual .one files, which do not perform the directory walk.",
  "id": "GHSA-4j5m-wc25-pvh7",
  "modified": "2026-05-21T21:32:11Z",
  "published": "2026-05-21T21:32:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/msiemens/onenote.rs/security/advisories/GHSA-4j5m-wc25-pvh7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/msiemens/onenote.rs/commit/c9267b2c96e2542be7e7b557d67318e81b733585"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/msiemens/onenote.rs"
    },
    {
      "type": "WEB",
      "url": "https://github.com/msiemens/onenote.rs/blob/master/CHANGELOG.md#111---2026-05-15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/msiemens/onenote.rs/releases/tag/v1.1.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rust OneNote File Parser: Path traversal in `Parser::parse_notebook` allows reading files outside the notebook directory"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-46671 (GCVE-0-2026-46671)

FKIE_CVE-2026-46671

GHSA-4J5M-WC25-PVH7

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature