Medium [CVE-2026-59930] Same-page navigation redirection due to predictable heading IDs
This medium-severity Red Hat Linux advisory covers CVE-2026-59930 affecting Migration Toolkit for Applications 8, Red Hat OpenShift AI (RHOAI), Red Hat Satellite 6.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
Mistune is a Python Markdown parser with renderers and plugins.
Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id="toc_N" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. This issue is fixed in version 3.3.0.
This could lead to unexpected behavior or information disclosure within the application. This flaw has a Moderate impact on Red Hat products that ship mistune 3.x with the toc plugin.
Exploitation requires the attacker to submit Markdown content to a multi-author rendering context where toc is enabled, limiting the practical attack surface. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N).
Weakness: CWE-79. Affected Red Hat products: Migration Toolkit for Applications 8; Red Hat OpenShift AI (RHOAI); Red Hat Satellite 6.
Red Hat lists Red Hat OpenShift Container Platform 4 as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Is CVE-2026-59930 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59930 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-59930?
Upgrade to a fixed release named by Red Hat:
- 3.3.0
Confirm against the vendor advisory before you patch.
- < 3.3.0
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- There are no known mitigations for this issue.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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