Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option
Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markdown input to inject arbitrary style declarations via the unvalidated figwidth option of the figure directive. Attackers can append declarations like background:url() to the rendered figure style attribute, forcing victim browsers to send requests to attacker servers and leak attribute values.
CVE-2026-115351
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: cve:CVE-2026-115351
mistune
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- 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.
[
{
"vendor": "lepture",
"product": "mistune",
"versions": [
{
"status": "affected",
"version": "3.2.1",
"lessThan": "3.3.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "3.3.0",
"versionType": "semver"
}
],
"packageURL": "pkg:pypi/mistune",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115351
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52316 · Revision 1
- Added to Heist Feed
- Publisher date