{"cve":"CVE-2026-39378","nvd":{"published":"2026-04-21T01:16:06.073","modified":"2026-10-26T21:10:00.170","status":"Analyzed","description":"The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. In versions 6.5 through 7.17.0, when `HTMLExporter.embed_images=True`, nbconvert's markdown renderer allows arbitrary file read via path traversal in image references. A malicious notebook can exfiltrate sensitive files from the conversion host by embedding them as base64 data URIs in the output HTML. nbconvert 7.17.1 contains a fix. As a workaround, do not enable `HTMLExporter.embed_images`; it is not enabled by default.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","score":6.5},"cwes":["CWE-22","CWE-73"],"references":["https://github.com/jupyter/nbconvert/releases/tag/v7.17.1","https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9"],"products":["jupyter:nbconvert"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-39378","score":0.00306,"percentile":0.2322,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-7jqv-fw35-gmx9","url":"https://osv.dev/vulnerability/GHSA-7jqv-fw35-gmx9","summary":"nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding","modified":"2026-09-10T03:50:43.685983757Z","packages":[{"ecosystem":"PyPI","name":"nbconvert","purl":"pkg:pypi/nbconvert","ranges":[">=6.5.0 <7.17.1"],"fixed":["7.17.1"]}]},{"id":"PYSEC-2026-2230","url":"https://osv.dev/vulnerability/PYSEC-2026-2230","summary":"","modified":"2026-07-13T07:15:37.724478345Z","packages":[{"ecosystem":"PyPI","name":"nbconvert","purl":"pkg:pypi/nbconvert","ranges":[">=6.5.0 <7.17.1"],"fixed":["7.17.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}