CVE-2026-111758 markdown-it - Denial of Service

markdown-it 14.1.0 < versions < 14.3.3 and 15.0.0 < versions < 15.0.3 contain a denial of service caused by inefficient handling of unclosed link reference definitions in src/rules_block/reference.ts, letting attackers cause high CPU usage, exploit requires no special options.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
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
20 October 2026
Updated
21 October 2026
Weakness
CWE-400

Vendor fix

Update to versions 14.3.3 or 15.0.3 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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