Marked allows Regular Expression Denial of Service (ReDoS) attacks
Date: 2025-05
Affected: npm/marked
Attack vector: dos
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2018-25110
CWE: CWE-1333

Marked prior to version 0.3.17 is vulnerable to a Regular Expression Denial of Service (ReDoS) attack due to catastrophic backtracking in several regular expressions used for parsing HTML tags and markdown links. An attacker can exploit this vulnerability by providing specially crafted markdown input, such as deeply nested or repetitively structured brackets or tag attributes, which cause the parser to hang and lead to a Denial of Service.


Mitigations:

Architectural layers (MAESTRO):