# CVE-2026-2327: markdown-it DoS — Fixed in 14.1.1

📦 npm

Not in CISA KEV

# CVE-2026-2327 — markdown-it

[Fix: markdown-it/markdown-it@4b4bbca](https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26)

CVE-2026-2327 is a CWE-1333 vulnerability in markdown-it. A fix is available for markdown-it — see the affected versions and patch details below.

markdown-it is has a Regular Expression Denial of Service (ReDoS)

Also known as[GHSA-38c4-r59v-3vqw](/vulnerability/GHSA-38c4-r59v-3vqw)

Published

Feb 12, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

## Exploitation Status

### Proof-of-concept exploit code exists

-   CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
-   CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-2327.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk

0.00%0.41%0.83%1.24%0.0%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

7Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

`markdown-it`npm

39.4Mdownloads / week

## Description

Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\*+$/ in the linkify function. An attacker can supply a long sequence of \* characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.

## Affected Packages

1 total 1 fixed

Ecosystem

Package

Vulnerable range

Fix

📦npm

`markdown-it` 

≥ 13.0.0&&< 14.1.1

14.1.1`npm install markdown-it@14.1.1`

## Affected Products

1 product · 1 configurations

Application

`markdown-it`markdown-it\_project

≥ 13.0.0 && < 14.1.1

range

## Detection & mitigation playbook

Open-source dependency

1.  ### Detect
    
    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for markdown-it, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Fix
    
    Update markdown-it to 14.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-2327 is resolved across your whole dependency graph.
    
3.  ### Workarounds
    
    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
    

## Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product

Fixed in

Advisory

Red Hat OpenShift Dev Spaces 3.28

`devspaces/openvsx-rhel9:1779528224`

[RHSA-2026:21772](https://access.redhat.com/errata/RHSA-2026:21772)

## Frequently Asked Questions

Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\\\*+$/ in the linkify function. An attacker can supply a long sequence of \* characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.

O3 Security · Impact-Aware SCA

### Is CVE-2026-2327 in your dependencies?

Find it across npm, including transitive dependencies.

[Scan my dependencies](/book-demo) [How O3 SCA works](/impact-aware-sca)