CVE-2026-77088

MediumCVSS 6.1/10Last modified Oct 12, 2026

Description

justhtml versions 0.9.0 through 1.21.0 contain a cross-site scripting vulnerability in to_markdown() where inline code spans fail to account for blank lines as block boundaries. Attackers can inject blank lines into code or pre element text to break the inline span, causing sanitized HTML to be emitted unescaped and re-parsed as live Markdown by compliant renderers.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

No affected versions have been published.

Timeline

Published
Aug 23, 2026
Last modified
Oct 12, 2026
NVD status
Deferred

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CVE-2026-77088: Medium severity, CVSS 6.1 | Vulnix