{"id":"DEBIAN-CVE-2026-39378","details":"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.","modified":"2026-09-14T17:03:10.195876695Z","published":"2026-04-21T01:16:06.073Z","upstream":["CVE-2026-39378"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-39378"}],"affected":[{"package":{"name":"nbconvert","ecosystem":"Debian:12","purl":"pkg:deb/debian/nbconvert?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.5.3-3","6.5.3-4","6.5.3-5","7.16.4-1","7.16.4-2","7.16.5-1","7.16.6-1","7.17.0-1","7.17.1-1","7.17.1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39378.json"}},{"package":{"name":"nbconvert","ecosystem":"Debian:13","purl":"pkg:deb/debian/nbconvert?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.16.6-1+deb13u1"}]}],"versions":["7.16.6-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39378.json"}},{"package":{"name":"nbconvert","ecosystem":"Debian:14","purl":"pkg:deb/debian/nbconvert?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.17.1-1"}]}],"versions":["7.16.6-1","7.17.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39378.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}