GHSA-h7ww-273w-6cm8

Suggest an improvement
Source
https://github.com/advisories/GHSA-h7ww-273w-6cm8
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h7ww-273w-6cm8/GHSA-h7ww-273w-6cm8.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-h7ww-273w-6cm8
Aliases
Published
2026-10-23T20:46:47Z
Modified
2026-10-23T21:00:06Z
Summary
Mistune: Path Traversal and XSS in Include directive
Details

The Include directive in src/mistune/directives/include.py does not validate that the resolved file path stays within the source directory, allowing path traversal via ../ sequences to read arbitrary files.

Additionally, error messages and included file contents are rendered without HTML escaping, leading to XSS even when escape=True.

Affected functions:

  • Path resolution (lines 27-31)
  • block_error() in html.py (line 140)
  • render_html_include() (line 72)

The Include plugin must be explicitly enabled via the plugins parameter.

Database specific 
{
    "cwe_ids":  [
        "CWE-22"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-23T20:46:47Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}
References

Affected packages

PyPI / mistune

Package

Name
mistune
View open source insights on deps.dev
Purl
pkg:pypi/mistune

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.3.0

Affected versions

0.*
0.1.0
0.2.0
0.3.0
0.3.1
0.4
0.4.1
0.5
0.5.1
0.6
0.7
0.7.1
0.7.2
0.7.3
0.7.4
0.8
0.8.1
0.8.2
0.8.3
0.8.4
2.*
2.0.0a1
2.0.0a2
2.0.0a3
2.0.0a4
2.0.0a5
2.0.0a6
2.0.0rc1
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.1.0
3.*
3.0.0a1
3.0.0a2
3.0.0a3
3.0.0rc1
3.0.0rc2
3.0.0rc3
3.0.0rc4
3.0.0rc5
3.0.0
3.0.1
3.0.2
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.2.0
3.2.1

Database specific

last_known_affected_version_range 
"<= 3.2.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h7ww-273w-6cm8/GHSA-h7ww-273w-6cm8.json"