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    CVE-2018-25110

    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.

    Published:May 23, 2025
    Last Modified:Aug 13, 2025
    EPS:May 23, 2025
    EPSS Score:0.00095
    CVSS Score:7.5

    Affected Products

    Vendor
    Marked Project
    Product
    Marked

    Exploits

    https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2018/CVE-2018-25110

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-41680 (CVSS 8.7) — Marked is a markdown parser and compiler. From 18.0.0 to 18.0.1, a critical Denial of Service (DoS) vulnerabil…
    CVE-2022-21680 (CVSS 7.5) — Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression `block.def` may caus…
    CVE-2022-21681 (CVSS 7.5) — Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression `inline.reflinkSearc…
    CVE-2021-21306 (CVSS 5.3) — Marked is an open-source markdown parser and compiler (npm package "marked"). In marked from version 1.1.1 and…
    CVE-2014-3743 (CVSS 6.1) — Multiple cross-site scripting (XSS) vulnerabilities in the Marked module before 0.3.1 for Node.js allow remote…
    CVE-2017-16114 (CVSS 7.5) — The marked module is vulnerable to a regular expression denial of service. Based on the information published …
    CVE-2016-10531 (CVSS 6.1) — marked is an application that is meant to parse and compile markdown. Due to the way that marked 0.3.5 and ear…
    CVE-2017-1000427 (CVSS 6.1) — marked version 0.3.6 and earlier is vulnerable to an XSS attack in the data: URI parser.…
    CVE-2015-8854 (CVSS 7.5) — The marked package before 0.3.4 for Node.js allows attackers to cause a denial of service (CPU consumption) vi…
    CVE-2015-1370 (CVSS 4.3) — Incomplete blacklist vulnerability in marked 0.3.2 and earlier for Node.js allows remote attackers to conduct …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High