DEBIAN-CVE-2026-6658
A vulnerability in jupyter/nbconvert versions <= 7.17.0 allows for Cross-site Scripting (XSS) via unsanitized `text/vnd.mermaid` output in HTML exports. The `data_mermaid` block in `share/templates/lab/base.html.j2` renders `text/vnd.mermaid` cell output directly into HTML without escaping, enabling attackers to inject arbitrary HTML/JavaScript by breaking out of the `` tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export.
DEBIAN-CVE-2026-6658
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-6658
nbconvert
Source reference: /affected/0/package/name
- Affected versions
- 6.5.3-3
Source reference:
/affected/0/versions6.5.3-4Source reference:
/affected/0/versions6.5.3-5Source reference:
/affected/0/versions7.16.4-1Source reference:
/affected/0/versions7.16.4-2Source reference:
/affected/0/versions7.16.5-1Source reference:
/affected/0/versions7.16.6-1Source reference:
/affected/0/versions7.17.0-1Source reference:
/affected/0/versions7.17.1-1Source reference:
/affected/0/versions7.17.1-2Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
nbconvert
Source reference: /affected/1/package/name
- Affected versions
- 7.16.6-1
Source reference:
/affected/1/versions7.16.6-1+deb13u1Source reference:
/affected/1/versions7.17.0-1Source reference:
/affected/1/versions7.17.1-1Source reference:
/affected/1/versions7.17.1-2Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
nbconvert
Source reference: /affected/2/package/name
- Affected versions
- 7.16.6-1
Source reference:
/affected/2/versions7.17.0-1Source reference:
/affected/2/versions7.17.1-1Source reference:
/affected/2/versions7.17.1-2Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nbconvert",
"purl": "pkg:deb/debian/nbconvert?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"6.5.3-3",
"6.5.3-4",
"6.5.3-5",
"7.16.4-1",
"7.16.4-2",
"7.16.5-1",
"7.16.6-1",
"7.17.0-1",
"7.17.1-1",
"7.17.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6658.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nbconvert",
"purl": "pkg:deb/debian/nbconvert?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"7.16.6-1",
"7.16.6-1+deb13u1",
"7.17.0-1",
"7.17.1-1",
"7.17.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6658.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nbconvert",
"purl": "pkg:deb/debian/nbconvert?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"7.16.6-1",
"7.17.0-1",
"7.17.1-1",
"7.17.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6658.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58304 · Revision 1
- Added to Heist Feed
- Publisher date