Description
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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| — | — | < 0.3.17 |
References
- https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2018/CVE-2018-25110Exploit, Third Party Advisory
- https://github.com/markedjs/marked/commit/20bfc106013ed45713a21672ad4a34df94dcd485Patch
- https://github.com/markedjs/marked/issues/1070Issue Tracking, Third Party Advisory
- https://github.com/markedjs/marked/pull/1083Issue Tracking, Patch
Timeline
- Published
- May 23, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed