CVE-2026-2327
Markdown-it ReDoS Vulnerability
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.
INFO
Published Date :
Feb. 12, 2026, 6:16 a.m.
Last Modified :
Feb. 23, 2026, 2:08 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update markdown-it to version 14.1.1 or later.
- Review regex usage for potential ReDoS issues.
- Apply security patches if available.
Public PoC/Exploit Available at Github
CVE-2026-2327 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2327.
| URL | Resource |
|---|---|
| https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 | Vendor Advisory |
| https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33 | Broken Link |
| https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26 | PatchProduct |
| https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750 | Third Party Advisory |
| https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 | Vendor Advisory |
| https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750 | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2327 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2327
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
JavaScript TypeScript PowerShell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2327 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-2327 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:markdown-it_project:markdown-it:*:*:*:*:*:*:*:* versions from (including) 13.0.0 up to (excluding) 14.1.1 Added Reference Type Snyk: https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 Types: Vendor Advisory Added Reference Type Snyk: https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33 Types: Broken Link Added Reference Type Snyk: https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26 Types: Patch, Product Added Reference Type Snyk: https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750 Types: Third Party Advisory Added Reference Type CISA-ADP: https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 Types: Vendor Advisory Added Reference Type CISA-ADP: https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750 Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 12, 2026
Action Type Old Value New Value Added Reference https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 Added Reference https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750 -
New CVE Received by [email protected]
Feb. 12, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-1333 Added Reference https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 Added Reference https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33 Added Reference https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26 Added Reference https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750