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Vulnerabilities

Vulnerability · CVE-2026-39377

The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates.

Published Apr 21, 2026 · catalog updated Jun 17, 2026 · The nbconvert tool, jupyter

Check if you run it

No confirmed exploitation is on record for CVE-2026-39377. EPSS is 0.40%. Act only if a listed version of The nbconvert tool, jupyter is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The nbconvert tool, jupyter).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Advisory link
Affected products
cpe jupyter/nbconvert

The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The passes attachment filenames directly to the filesystem without sanitization, enabling path traversal attacks. This vulnerability provides complete control over both the destination path and file extension. Version 7.17.1 contains a patch.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe jupyter/nbconvertversion unspecified

How to fix CVE-2026-39377

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-39377. EPSS is 0.40%. Act only if a listed version of The nbconvert tool, jupyter is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-22: Path Traversal; CWE-73. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 21, 2026 · NIST NVD

    Detected

    The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The passes attachment filenames directly to the filesystem without sanitization, enabling path traversal atta

  2. Jun 17, 2026 · NIST NVD

    Updated

    The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The passes attachment filenames directly to the filesystem without sanitization, enabling path traversal atta

Sources

  • CVE.orgVulnerability recordCVE-2026-39377

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-39377

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-39377

    The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.