CVE-2026-59926
- Source
- https://cve.org/CVERecord?id=CVE-2026-59926
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59926.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-59926
- Aliases
- Downstream
- Related
- Published
- 2026-07-08T16:16:15.681Z
- Modified
- 2026-08-05T03:32:40.505481635Z
- Severity
-
- 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N CVSS Calculator
- Summary
- Mistune: XSS via unescaped class option in Admonition directive
- Details
-
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59926.json", "unresolved_ranges": [ { "extracted_events": [ { "fixed": "3.2.1" } ], "source": "AFFECTED_FIELD" } ], "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-79" ] }- References
-
- https://github.com/lepture/mistune/releases/tag/v3.2.1
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59926.json
- https://github.com/lepture/mistune/security/advisories/GHSA-g97x-gvcm-x72h
- https://nvd.nist.gov/vuln/detail/CVE-2026-59926
- https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2
Affected packages
Git / github.com/lepture/mistune
Affected versions
v0.*
v0.1.0
v0.2.0
v0.3.0
v0.3.1
v0.4
v0.4.1
v0.5
v0.5.1
v0.6
v0.7
v0.7.1
v0.7.2
v0.7.3
v0.7.4
v0.8
v0.8.1
v0.8.2
v0.8.3
v0.8.4
v2.*
v2.0.0
v2.0.0a1
v2.0.0a2
v2.0.0a3
v2.0.0a4
v2.0.0a5
v2.0.0a6
v2.0.0rc1
v2.0.1
v2.0.2
v3.*
v3.0.0
v3.0.0a1
v3.0.0a2
v3.0.0a3
v3.0.0rc1
v3.0.0rc2
v3.0.0rc3
v3.0.0rc4
v3.0.0rc5
v3.0.1
v3.1.0
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.2.0