Security incident · CVE-2026-114140
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates.
Published Oct 21, 2026 · catalog updated Oct 22, 2026 · The nbconvert tool, jupyter
Last checked Nov 5, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-114140. EPSS is 0.46%. 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 vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High8.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.46%
- Remediation
- Version ranges on file
- Affected products
- PyPI nbconvert · package pip · pip nbconvert · pypi nbconvert
### Summary nbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute. Vulnerable converters : , , , . In , joins attacker-controlled to with no canonicalization check, enabling arbitrary file write. This is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg. ### Impact If a victim runs nbconvert on a malicious ipynb file, it can create some files with arbitrary data in arbitrary locations, i.e. override authorized_keys. Note that running the cell with jupyter overrides the output, so it would "clean up" malicious cells. ### PoC In a ipynb file: ### Patches Fixed in - https://github.com/jupyter/nbconvert/commit/ce4bd99aec31d81d759fa8eeb8643179392ec66f - [7.17.2](https://github.com/jupyter/nbconvert/releases/tag/v7.17.2)
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.
- PyPI nbconvert5.4.0 → 7.17.2
- package pipversion unspecified
- pip nbconvert>= 5.4.0, <= 7.17.1
- pypi nbconvertversion unspecified
How to fix CVE-2026-114140
Upgrade
CVE-2026-114140 lists a fix boundary at 7.17.2. Compare the installed build with that boundary before you change production.
Version check
Affected <= 7.17.1
Advisory
Open the cve_org record and follow its fix.
Official advisories
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-2026-114140. EPSS is 0.46%. Act only if a listed version of The nbconvert tool, jupyter is installed.
Which versions are affected?
Compare what you have installed with 5.4.0 → 7.17.2, >= 5.4.0, <= 7.17.1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-22: Path Traversal. EPSS 0.46%. 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.
Oct 21, 2026 · NIST NVD
Detected
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. From 5.4.0 until 7.17.2, ExtractOutputPreprocessor in nbconvert/preprocessors/extractoutput.py joins the attacker-controlled cell output metadata filename to output_files_dir without limiting the result to the intended directory. When a victim converts a malicious notebook with the markd
Oct 22, 2026 · GitHub Advisory Database
Updated
### Summary nbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute. Vulnerable converters : , , , . In , joins attacker-controlled to with no canonicalization check, enabling arbitrary file write. This is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg. ### Impact
Oct 22, 2026 · PyPA Advisory Database
Fix available
nbconvert fixed in 7.17.2
Oct 22, 2026 · PyPA Advisory Database
Fix available
nbconvert fixed in 7.17.2
Oct 22, 2026 · PyPA Advisory Database
Updated
### Summary nbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute. Vulnerable converters : , , , . In , joins attacker-controlled to with no canonicalization check, enabling arbitrary file write. This is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg. ### Impact
Sources
- CVE.orgVulnerability recordCVE-2026-114140
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-114140
30-day exploitation probability 0.46%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-pjvx-prjx-h659
nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-114140
nbconvert https://github.com/advisories/GHSA-4c99-qj7h-p3vg .
advisories.gitlab.com - NIST NVDVulnerability recordCVE-2026-114140
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. From 5.4.0 until 7.17.2, ExtractOutputPreprocessor in nbconvert/preprocessors/extractoutput.py joins the attacker-controlled cell output metadata filename to output_fil
nvd.nist.gov - PyPA Advisory DatabasePackage advisoryGHSA-pjvx-prjx-h659
nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc
osv.dev - Snyk Vulnerability DatabasePackage advisorySNYK-PYTHON-NBCONVERT-21460689
Directory Traversal
security.snyk.io
References
Freshness
Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 5, 2026
- Snyk Vulnerability DatabaseOct 25, 2026
- GitHub Advisory DatabaseOct 23, 2026
- GitLab Advisory DatabaseOct 23, 2026
- PyPA Advisory DatabaseOct 23, 2026
- CVE.orgOct 22, 2026
- NIST NVDOct 22, 2026