Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option
Impact
Mistune versions before 3.3.0 have a CSS injection vulnerability via the figwidth option, allowing attackers to inject style declarations. Attackers can force victim browsers to send requests to attacker servers.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.Affected packages
Affected products
Vendor version evidence. Product records are separate from automatic dependency matching.
lepture · VulnCheck
mistune
2 ranges
lepture · VulnCheck
mistune
Package identity
pkg:pypi/mistuneExplore mistune →Identity supplied by VulnCheck. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
3.2.1 → before 3.3.0
semver versions
unaffected
3.3.0
semver versions
Other versions: unaffected
Original source description
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.
Inside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-115351View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Environment requirements
These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.
VulnCheck · platform conditions
Any condition may hold
Vulnerable product
cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*From (inclusive): 3.2.1
Before: 3.3.0
Original applicability statements
[
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.2.1",
"versionEndExcluding": "3.3.0"
}
]
}
]
}
]Contributing organizations · 2
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Additional data publisher
What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.