Marked allows Regular Expression Denial of Service (ReDoS) attacks
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | marked | < 0.3.17 | 0.3.17 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2018-25110
- https://github.com/markedjs/marked/issues/1070
- https://github.com/markedjs/marked/pull/1083
- https://github.com/markedjs/marked/commit/20bfc106013ed45713a21672ad4a34df94dcd485
- https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2018/CVE-2018-25110
- https://github.com/markedjs/marked
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-1333- Platform
- npm
- Package
marked- Disclosed
- 23.05.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-p9wx-2529-fp83 - CC BY 4.0
Vulnerability history: marked
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 13
- First → latest
- 10.2017 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 7
- Low 1
Disclosures per year
- 2017: 2
- 2018: 2
- 2019: 2
- 2020: 2
- 2021: 1
- 2022: 2
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 1
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Marked allows Regular Expression Denial of Service (ReDoS) attacks this entry
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