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CVE-2026-2327

Quick assessment

Affected
n/a markdown-it
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Markdown-It是Markdown it!开源的一个 Markdown 解析器。 Markdown-It 14.1.1之前版本存在安全漏洞，该漏洞源于linkify函数使用正则表达式，可能导致正则表达式拒绝服务。

CVSS 5.3 · Medium EPSS 0.74% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-2327

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Markdown-It 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Markdown-It是Markdown it!开源的一个 Markdown 解析器。 Markdown-It 14.1.1之前版本存在安全漏洞，该漏洞源于linkify函数使用正则表达式，可能导致正则表达式拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
- markdown-it 13.0.0 ~ 14.1.1 -

II. Public POCs for CVE-2026-2327

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: ReDoS confirmed via /\*+$/ regex in markdown-it linkify - vulnerable regex took 4948ms vs 0ms for fixed code (50000 * chars payload)
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 3239 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-2327

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Proof of Concept for CVE-2026-2327 (1)

Same Patch Batch · n/a · 2026-02-12 · 22 CVEs total

CVE-2026-2006 8.8 HIGH PostgreSQL missing validation of multibyte character length executes arbitrary code
CVE-2026-2005 8.8 HIGH PostgreSQL pgcrypto heap buffer overflow executes arbitrary code
CVE-2026-2004 8.8 HIGH PostgreSQL intarray missing validation of type of input to selectivity estimator executes
CVE-2026-2007 8.2 HIGH PostgreSQL pg_trgm heap buffer overflow writes pattern onto server memory
CVE-2025-56647 6.5 MEDIUM farm 安全漏洞
CVE-2026-2003 4.3 MEDIUM PostgreSQL oidvector discloses a few bytes of memory
CVE-2026-25828 grub-btrfs 安全漏洞
CVE-2025-67432 Monkeybread MBS DynaPDF Plugin 安全漏洞
CVE-2025-67433 Open TFTP Server MultiThreaded 安全漏洞
CVE-2025-70092 opensourcepos 安全漏洞
CVE-2025-70314 webfsd 安全漏洞
CVE-2025-70845 aidigu 安全漏洞
CVE-2025-69634 Dolibarr ERP & CRM 安全漏洞
CVE-2025-69807 bareiron 安全漏洞
CVE-2025-69806 bareiron 安全漏洞
CVE-2025-63421 Filosoft Comerc32 安全漏洞
CVE-2025-70981 FIT2CLOUD CordysCRM 安全漏洞
CVE-2025-61880 Infoblox NIOS 安全漏洞
CVE-2025-61879 Infoblox NIOS 安全漏洞
CVE-2025-69752 Ideagen Q-Pulse 安全漏洞

Showing top 20 of 22 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: markdown-it
Same vendor: n/a
Same weakness: CWE-1333

V. Comments for CVE-2026-2327

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