CVE-2018-25110

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

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

marked

CVSS v4.0 CNA

6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v4.0 GitHub

6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.61% chance of exploitation in the next 30 days, 48th percentile

Published

2025-05-23

Proof-of-concept exploits (1)

• Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2018/CVE-2018-251101★ · 2025-09-08

Security advisories

• markedjs/marked/issues/1070
• advisories/GHSA-p9wx-2529-fp83

References

• CVE Record
• NVD entry

Related

• CVE-2014-125127
• CVE-2014-125128
• CVE-2019-25225