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Medium severity6.1OSV Advisory· Published Aug 23, 2026· Updated Aug 26, 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.

AI Insight

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Affected products

2
  • Emilstenstrom/JusthtmlOSV2 versions
    v1.12.0, v1.11.0, v1.10.0, …+ 1 more
    • (no CPE)range: v1.12.0, v1.11.0, v1.10.0, …
    • (no CPE)range: <1.13.0

Patches

Vulnerability mechanics

References

2

News mentions

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