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CVE-2025-6493— CodeMirror Markdown Mode markdown.js redos

Quick assessment

Affected
n/a CodeMirror
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CodeMirror是Codemirror团队的一个使用JavaScript为浏览器实现的多功能文本编辑器。该软件专门用于编辑代码，并具有100多种语言模式和各种插件，可实现更高级的编辑功能，每种语言都带有功能齐全的代码和语法高亮显示，以帮助阅读和编辑复杂代码。 CodeMirror 5.17.0及之前版本存在安全漏洞，该漏洞源于文件mode/markdown/markdown.js存在低效正则表达式复杂性。

CVSS 5.3 · Medium EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-6493

Vulnerability Information
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Vulnerability Title
CodeMirror Markdown Mode markdown.js redos
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in CodeMirror up to 5.65.20. Affected is an unknown function of the file mode/markdown/markdown.js of the component Markdown Mode. This manipulation causes inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be exploited. Upgrading to version 6.0 is able to address this issue. You should upgrade the affected component. Not all code samples mentioned in the GitHub issue can be found. The repository mentions, that "CodeMirror 6 exists, and is [...] much more actively maintained."
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
CodeMirror 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CodeMirror是Codemirror团队的一个使用JavaScript为浏览器实现的多功能文本编辑器。该软件专门用于编辑代码，并具有100多种语言模式和各种插件，可实现更高级的编辑功能，每种语言都带有功能齐全的代码和语法高亮显示，以帮助阅读和编辑复杂代码。 CodeMirror 5.17.0及之前版本存在安全漏洞，该漏洞源于文件mode/markdown/markdown.js存在低效正则表达式复杂性。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- CodeMirror 5.65.0 -

II. Public POCs for CVE-2025-6493

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III. Intelligence Information for CVE-2025-6493

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Other References for CVE-2025-6493 (1)

IV. Related Vulnerabilities

Same product: CodeMirror
Same vendor: n/a
Same weakness: CWE-1333

V. Comments for CVE-2025-6493

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