CVE-2026-39378

{"id": "CVE-2026-39378", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "published": "2026-04-21T01:16:06.073", "references": [{"url": "https://github.com/jupyter/nbconvert/releases/tag/v7.17.1", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-73"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-04-23T17:50:56.100", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:jupyter:nbconvert:*:*:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "B8ACC92D-6ED7-40BE-917E-5527F6746B60", "versionEndExcluding": "7.17.1", "versionStartIncluding": "6.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}