Is CVE-2026-2327 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-2327 being exploited in the wild.

How severe is CVE-2026-2327?

Low severity, with a CVSS score of 3.1, published 12 February 2026.

Which products and versions are affected?

markdown-it (npm) SEMVER:introduced=13.0.0,fixed=14.1.1.

Is there a fix for CVE-2026-2327?

Yes. markdown-it (npm): upgrade to 14.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-2327 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-2327?

Check whether you run markdown-it (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-2327: markdown-it ReDoS in linkify regex

CVE-2026-2327 · Severity: low · CVSS 3.1 · Published 2026-02-12

markdown-it is a widely used markdown parser that converts markdown text into HTML. A vulnerability in its linkify feature allows attackers to craft specially formatted input containing long sequences of asterisks followed by a non-matching character, causing the parser to consume excessive CPU resources and become unresponsive. This can lead to denial-of-service attacks against any web application or service that processes user-supplied markdown content.

Technologies: markdown-it (npm). Vendors: npm.

Quick answers

Is CVE-2026-2327 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-2327 being exploited in the wild.
How severe is CVE-2026-2327?: Low severity, with a CVSS score of 3.1, published 12 February 2026.
Which products and versions are affected?: markdown-it (npm) SEMVER:introduced=13.0.0,fixed=14.1.1.
Is there a fix for CVE-2026-2327?: Yes. markdown-it (npm): upgrade to 14.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-2327 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-2327?: Check whether you run markdown-it (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

markdown-it (npm): upgrade to 14.1.1 or later
```
npm install markdown-it@14.1.1
```

Technical details

The vulnerability is a Regular Expression Denial of Service (ReDoS) vulnerability in the linkify function, specifically in the regex pattern /*+$/ used to strip trailing asterisks from detected URLs. The vulnerable code exists in versions 13.0.0 through 14.1.0. An attacker can supply a string like "https://test.com?" followed by thousands of asterisks and a non-matching character (e.g., 'a'), which causes catastrophic backtracking in the regex engine as it attempts to match the pattern. The attack requires no authentication and can be triggered remotely by any user who can submit markdown content to an application using the vulnerable library with linkify enabled. Processing a maliciously crafted input can cause the application to hang, consuming significant CPU resources. The vulnerability was fixed in version 14.1.1 by optimizing the regex pattern to avoid excessive backtracking.

Affected products

markdown-it markdown-it 13.0.0 to 14.1.0

Identifiers

CVE-2026-2327
GHSA-38c4-r59v-3vqw

Timeline

2025-07-05: disclosed
2026-02-12: advisory
2026-02-13: patched: Fixed in version 14.1.1

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.