Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• Debian:12 mistune2.0.4-1, 2.0.4-2, 3.0.2-1
• Debian:13 mistune3.1.3-1, 3.1.4-1, 3.3.4-1
• Debian:14 mistune3.1.3-1, 3.1.4-1, 3.3.4-1
• vendor lepture mistuneversion unspecified

How to fix CVE-2026-115350

• No stored fix

  No vendor fix text is stored. Use the linked advisory before you change production.

• Version check

  Seen in 2.0.4-1 · 8 other packages on the advisory

• Advisory

  Open the cve_org record and follow its fix.

• Official advisories

  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • Red Hat Security Data · access.redhat.com
  • Trivy Vulnerability DB · osv.dev

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Oct 23, 2026 · Trivy Vulnerability DB

   Detected

   Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an include directive, combined with path traversal, to execute stored scripts when escape=False is set.

2. Oct 23, 2026 · Trivy Vulnerability DB

   Updated

   Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an include directive, combined with path traversal, to execute stored scripts when escape=False is set.

Sources

• CVE.orgVulnerability recordCVE-2026-115350

  Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an include directive, c

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-115350

  30-day exploitation probability 0.19%

  first.org
• Red Hat Security DataVendor advisoryCVE-2026-115350

  mistune: mistune: Cross-site scripting via Include directive

  access.redhat.com
• Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-115350

  Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an include directive, c

  osv.dev

References

• GitHub Security Advisory (GHSA-96vr-jm8v-g22j) · github.com
• ADVISORY · security-tracker.debian.org
• VulnCheck Advisory: Mistune before 3.3.0 Stored XSS via Include Directive HTML F · vulncheck.com

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

• FIRST EPSSNov 4, 2026
• Red Hat Security DataOct 23, 2026
• CVE.orgOct 23, 2026
• Trivy Vulnerability DBOct 23, 2026