{"id":"CVE-2026-46671","sourceIdentifier":"security-advisories@github.com","published":"2026-07-20T16:17:01.630","lastModified":"2026-10-24T20:10:00.137","vulnStatus":"Analyzed","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'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."},{"lang":"es","value":"Analizador de archivos OneNote de Rust es un analizador para archivos de Microsoft OneNote implementado en Rust. Antes de la versión 1.1.1, un archivo de tabla de contenidos ’.onetoc2’ creado maliciosamente puede causar que “Parser::parse_notebook” abra archivos arbitrarios en el sistema de archivos del host fuera del directorio del bloc de notas. El analizador lee los nombres de entrada listados dentro del ’.onetoc2’ y los une con el directorio base del bloc de notas sin validar que sean rutas relativas confinadas a ese directorio. El analizador fallará cuando el archivo objetivo no se pueda analizar como una sección de OneNote, por lo que la exfiltración directa de contenido a través del valor de retorno del analizador no es práctica, aunque el sondeo de existencia de archivos y la denegación de servicio a través de archivos grandes o especiales siguen siendo posibles. Cualquiera que use “onenote_parser” para analizar archivos .onetoc2 recibidos de fuentes no confiables está afectado. Los usuarios que solo analizan sus propios blocs de notas no corren un riesgo significativo. El problema está solucionado en onenote_parser 1.1.1. La solución rechaza las rutas absolutas, los componentes de directorio padre y otros caracteres de ruta no válidos en los nombres de entrada, y adicionalmente canoniza la ruta resuelta para confirmar que permanece dentro del directorio base del bloc de notas. Para los usuarios que no pueden actualizar a la versión 1.1.1, solo deben llamar a “Parser::parse_notebook” en archivos ’.onetoc2’ de fuentes confiables. Alternativamente, use “Parser::parse_section” / “Parser::parse_section_buffer” en archivos .one individuales, que no realizan el recorrido del directorio."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"msiemens","product":"onenote.rs","versions":[{"version":"< 1.1.1","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","baseScore":4.4,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":1.8,"impactScore":2.5}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-20T17:31:48.779092Z","id":"CVE-2026-46671","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-22"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:msiemens:rust_onenote_file_parser:*:*:*:*:*:rust:*:*","versionEndExcluding":"1.1.1","matchCriteriaId":"983B4322-C52D-466B-A4B0-88D73151A3AF"}]}]}],"references":[{"url":"https://github.com/msiemens/onenote.rs/blob/master/CHANGELOG.md#111---2026-05-15","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/msiemens/onenote.rs/commit/c9267b2c96e2542be7e7b557d67318e81b733585","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/msiemens/onenote.rs/releases/tag/v1.1.1","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/msiemens/onenote.rs/security/advisories/GHSA-4j5m-wc25-pvh7","source":"security-advisories@github.com","tags":["Patch","Release Notes","Vendor Advisory","Mitigation"]}]}