CVE-2026-111759
What it is
markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, when typographer: true is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input. Many opening double quotes followed by unmatched closing single quotes cause repeated scans of the entire opener stack. The same issue occurs with the quote types reversed. The default configuration (typographer: false) is not affected, but this option is enabled with high probability. This issue is fixed in versions 14.3.2 and 15.0.2.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- Exploit odds
- 0.6% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.6% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.6% · EPSS, next 30 days
- Weakness
- CWE-400 · Uncontrolled resource consumption
- Record status
- Awaiting Analysis
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-111759.md and follow it. Check whether this project is affected by CVE-2026-111759. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c79af2c8670
- https://github.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d67b030a4152
- https://github.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725fb5990b8162
- https://github.com/markdown-it/markdown-it/releases/tag/14.3.2
- https://github.com/markdown-it/markdown-it/releases/tag/15.0.2
- https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7
- https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7
References
- https://github.com/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c79af2c8670
- https://github.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d67b030a4152
- https://github.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725fb5990b8162
- https://github.com/markdown-it/markdown-it/releases/tag/14.3.2
- https://github.com/markdown-it/markdown-it/releases/tag/15.0.2
- https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7
- https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7