CVE-2026-115351
Medium · 4.7CVSS
4.7
EPSS
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Published
Oct 22, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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