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EUVD-2026-232846

fkie_cve-2022-21670

markdown-it is a Markdown parser. Prior to version 1.3.2, special patterns with length greater than 50 thousand characterss could slow down the parser significantly. Users should upgrade to version 12.3.2 to receive a patch. There are no known workarounds aside from upgrading.

GHSA-6vfc-qv3f-vr6c — Uncontrolled Resource Consumption in markdown-it

Affected: npm: markdown-it

### Impact

Special patterns with length > 50K chars can slow down parser significantly.

```js const md = require('markdown-it')();

md.render(`x ${' '.repeat(150000)} x \nx`); ```

### Patches

Upgrade to v12.3.2+

### Workarounds

No.

### References

Fix + test sample: https://github.com/markdown-it/markdown-it/commit/ffc49ab46b5b751cd2be0aabb146f2ef84986101

gsd-2022-21670

UBUNTU-CVE-2022-21670

Affected: Ubuntu:22.04:LTS: node-markdown-it, Ubuntu:24.04:LTS: node-markdown-it, Ubuntu:25.10: node-markdown-it, Ubuntu:26.04:LTS: node-markdown-it