TI-2018-15336 Aliases CVE-2018-25110 GHSA-p9wx-2529-fp83

Regular Expression Denial of Service (ReDoS) in markedjs/marked

HIGH 70CWE-1333Published 2025-05-23 · Updated 2025-05-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0061 49th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix Fixed marked: 0.3.17marked (npm): 0.3.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	marked	before 0.3.17	0.3.17	Patch available	CNA
—	marked (npm)	before 0.3.17	0.3.17	Patch available	GHSA-p9wx-2529-fp83

marked Vendor— Affected before 0.3.17 Fixed in 0.3.17 Patch available CNA
marked (npm) Vendor— Affected before 0.3.17 Fixed in 0.3.17 Patch available GHSA-p9wx-2529-fp83

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:marked_project:marked::::::node.js::*	before 0.3.17	Vulnerable	markedjs

cpe:2.3:a:marked_project:marked:*:*:*:*:*:node.js:*:* Versions before 0.3.17 Vulnerable ·markedjs

Remediation

Fix · CNA marked Fixed in 0.3.17
Fix · GHSA-p9wx-2529-fp83 marked (npm) Fixed in 0.3.17 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2018-25110
2026-10-03 Alias added: GHSA-p9wx-2529-fp83

References

Exploit 1

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

Patch 2

Advisory 2

Other 1

https://github.com/markedjs/marked

TI-2026-30197 Marked: OOM Denial of Service via Infinite Recursion in marked Tokenizer CVSS 4.0HIGH 8.7
TI-2022-06057 Exponential catastrophic backtracking (ReDoS) in marked CVSS 3.1HIGH 7.5
TI-2022-06056 Cubic catastrophic backtracking (ReDoS) in marked CVSS 3.1HIGH 7.5
TI-2015-07284 The marked package before 0.3.4 for Node.js allows attackers to cause a denial of service… CVSS 3.1HIGH 7.5
TI-2021-04406 Denial of Service in Marked CVSS 3.1HIGH 7.5
TI-2017-11833 Uncontrolled resource consumption in HackerOne marked node module CVSS 3.0HIGH 7.5

See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences