Medium severity6.1NVD Advisory· Published Aug 23, 2026
CVE-2026-5389
CVE-2026-5389
Description
justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content. Attackers can place backticks inside sanitized pre elements to break out of fixed-length code fences, allowing raw HTML to execute when the generated Markdown is rendered by CommonMark or GFM-style renderers.
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Affected products
1- Range: <1.13.0
Patches
Vulnerability mechanics
References
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