CVE-2026-111759 markdown-it - Denial of Service

markdown-it prior to 14.3.2 and 15.0.2 contains a denial of service caused by quadratic processing time in the smartquotes rule when typographer: true is enabled, letting attackers cause application slowdown via crafted Markdown, exploit requires typographer option enabled.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.60% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
19 October 2026
Updated
21 October 2026
Weakness
CWE-400

Vendor fix

Update to versions 14.3.2 or 15.0.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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