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No exploitation reportedFix available

CVE-2021-32798

No exploitation reported by the sources we read.

  • Published2021-08-09
  • Fixed in6.4.1 · 5.7.11
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The Jupyter notebook is a web-based notebook environment for interactive computing. In affected versions untrusted notebook can execute code on load. Jupyter Notebook uses a deprecated version of Google Caja to sanitize user inputs. A public Caja bypass can be used to trigger an XSS when a victim opens a malicious ipynb document in Jupyter Notebook. The XSS allows an attacker to execute arbitrary code on the victim computer using Jupyter APIs.

Timeline

dates in UTC
  1. 2021-08-0921:15CVE publishedNVD

Versions per branch

OSV · NVD
Jupyter notebook
BranchAffectedFixed in
6.4≥ 6.4.0, < 6.4.16.4.1
6.x≥ 6.0.0, < 6.4.16.4.1
5.7≥ 5.7.0, < 5.7.115.7.11
5.7< 5.7.115.7.11
6.4= 6.4.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • jupyter-notebookUbuntu:20.04:LTSall versions · no fixed version listed
  • jupyter-notebookUbuntu:18.04:LTSall versions · no fixed version listed
  • jupyter-notebookDebian:14all versions · fixed in 6.4.3-1
  • jupyter-notebookDebian:13all versions · fixed in 6.4.3-1
  • jupyter-notebookDebian:12all versions · fixed in 6.4.3-1
  • python-notebookSUSE:Package Hub 15 SP6all versions · fixed in 5.7.11-bp156.4.3.1
  • python-notebookopenSUSE:Leap 15.6all versions · fixed in 5.7.11-bp156.4.3.1

Full record on NVD

Fix

  1. Update Jupyter notebook to 6.4.1 · 5.7.11

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.110known since 2026-10-23
  • NVDCVSS 3.19.6read 2026-10-23
  • NVDCVSS 2.06.8read 2026-10-23
  • CNAweakness (CWE)CWE-79known since 2026-10-23
  • NVDweakness (CWE)CWE-79read 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2021-08-23

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Published
2021-08-09
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-hwvq-6gjx-j797

Frequently asked questions

What is CVE-2021-32798?

The Jupyter notebook is a web-based notebook environment for interactive computing. In affected versions untrusted notebook can execute code on load. Jupyter Notebook uses a deprecated version of Google Caja to sanitize user inputs. A public Caja bypass can be used to trigger an XSS when a victim opens a malicious ipynb document in Jupyter Notebook. The XSS allows an attacker to execute arbitrary code on the victim computer using Jupyter APIs.

Is CVE-2021-32798 actively exploited?

Active exploitation of CVE-2021-32798 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-32798?

CVE-2021-32798 has a CVSS v3 base score of 9.6 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

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