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CVE-2026-115355high8.7

Mistune before 3.3.0 Path Traversal and XSS via Include Directive

Impact

Mistune before 3.3.0 has a path traversal vulnerability in the Include directive, allowing attackers to read arbitrary files and inject HTML for cross-site scripting. Attackers need to supply ../ sequences in include paths. This affects versions less than 3.3.0.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

lepture · VulnCheck

mistune

2 ranges
VulnCheck version evidence

Package identity

pkg:pypi/mistuneExplore mistune →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 3.3.0

semver versions

unaffected

3.3.0

semver versions

unknown

Other versions: unaffected

Original source description

Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read arbitrary files by supplying ../ sequences in include paths. Attackers can also inject HTML through unescaped error messages and included file contents to perform cross-site scripting even when escape=True is set.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115355

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-22 ↗

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*

Before: 3.3.0

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "3.3.0"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-22
CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

2 sources
github.com/lepture/mistune/security/advisories/GHSA-h7ww-273w-6cm8
vendor-advisoryVulnCheck
www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-and-xss-via-include-directive
third-party-advisoryVulnCheck