CVE-2018-25110

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

HIGH
7.5
CVSS Score
Published: May 23, 2025 at 02:53 PM UTC
Updated: June 17, 2026 at 01:54 AM UTC
2 products affected across 2 vendorsMarkedMarked

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 0.3.17
Affected range stops below 0.3.17, so it looks safe — our inference, not a vendor statement
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (4)

ExploitThird Party Advisory
Source: 596c5446-0ce5-4ba2-aa66-48b3b757a647
https://github.com/Checkmarx/Vulnerabilities-Proofs-of-Concept/tree/main/2018/CVE-2018-25110
Issue TrackingThird Party Advisory
Source: 596c5446-0ce5-4ba2-aa66-48b3b757a647
https://github.com/markedjs/marked/issues/1070
Issue TrackingPatch
Source: 596c5446-0ce5-4ba2-aa66-48b3b757a647
https://github.com/markedjs/marked/pull/1083

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1333

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