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.
CVE-2018-25110
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 26% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 39.0%
- KEV
- Not listed
Published
May 23, 2025
Last Modified
August 13, 2025
References (4)
- 596c5446-0ce5-4ba2-aa66-48b3b757a647https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2018/CVE-2018-25110
- 596c5446-0ce5-4ba2-aa66-48b3b757a647https://github.com/markedjs/marked/commit/20bfc106013ed45713a21672ad4a34df94dcd485
- 596c5446-0ce5-4ba2-aa66-48b3b757a647https://github.com/markedjs/marked/issues/1070
- 596c5446-0ce5-4ba2-aa66-48b3b757a647https://github.com/markedjs/marked/pull/1083
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| marked | — | 0.3.17 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 52× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-15 16:55 UTCEPSS rescore
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- 2026-05-30 04:45 UTCEG score recompute
- 2026-05-29 13:41 UTCEPSS rescore
Frequently asked(5)
What is CVE-2018-25110?
When was CVE-2018-25110 disclosed?
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What is the CVSS score of CVE-2018-25110?
How do I remediate CVE-2018-25110?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-25110
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