Medium severity6.1GHSA Advisory· Published May 26, 2026· Updated May 28, 2026
CVE-2026-44897
CVE-2026-44897
Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening tag by string-concatenating the id attribute value directly into the HTML — with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character " in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
mistunePyPI | < 3.2.1 | 3.2.1 |
Affected products
5- osv-coords4 versionspkg:apk/chainguard/datahub-ingestion-fipspkg:apk/chainguard/kubeflow-pipelines-visualization-serverpkg:apk/wolfi/kubeflow-pipelines-visualization-serverpkg:rpm/opensuse/python-mistune&distro=openSUSE%20Tumbleweed
< 1.5.0.1-r2+ 3 more
- (no CPE)range: < 1.5.0.1-r2
- (no CPE)range: < 2.16.1-r2
- (no CPE)range: < 2.16.1-r2
- (no CPE)range: < 3.2.1-1.1
Patches
Vulnerability mechanics
References
4- github.com/lepture/mistune/security/advisories/GHSA-v87v-83h2-53w7nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-v87v-83h2-53w7ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-44897ghsaADVISORY
- github.com/lepture/mistune/releases/tag/v3.2.1nvdProductRelease NotesWEB
News mentions
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