# CVE-2021-32862: nbconvert: The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert

CVE-2021-32862 is fixed in nbconvert on 1 platform, first by DEBIAN-CVE-2021-32862, released August 18, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-32862
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0152
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 18, 2022

## Description

The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert. When using nbconvert to generate an HTML version of a user-controllable notebook, it is possible to inject arbitrary HTML which may lead to cross-site scripting (XSS) vulnerabilities if these HTML notebooks are served by a web server (eg: nbviewer).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | nbconvert Debian 11.6 (bullseye) | 5.6.1-3+deb11u1 | [DLA-3863-1](https://patchblox.com/security/data/fix/linux/dla-3863-1.md) | Sep 2, 2024 |
| Linux | nbconvert Debian 12.15 (bookworm) | 6.5.1-1 | [DEBIAN-CVE-2021-32862](https://patchblox.com/security/data/fix/linux/debian-cve-2021-32862.md) | Aug 18, 2022 |
| Linux | nbconvert Debian 13.5 (trixie) | 6.5.1-1 | [DEBIAN-CVE-2021-32862](https://patchblox.com/security/data/fix/linux/debian-cve-2021-32862.md) | Aug 18, 2022 |
| Linux | nbconvert Debian 14 | 6.5.1-1 | [DEBIAN-CVE-2021-32862](https://patchblox.com/security/data/fix/linux/debian-cve-2021-32862.md) | Aug 18, 2022 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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