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CVE-2021-21306

Denial of Service in Marked

HIGH
7.5
CVSS Score
Published: February 8, 2021 at 09:20 PM UTC
Updated: June 17, 2026 at 03:35 AM UTC
2 products affected across 2 vendorsMarkedMarked

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

Marked is an open-source markdown parser and compiler (npm package "marked"). In marked from version 1.1.1 and before version 2.0.0, there is a Regular expression Denial of Service vulnerability. This vulnerability can affect anyone who runs user generated code through marked. This vulnerability is fixed in version 2.0.0.

Affected

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

Marked· Marked Projectnpm
95%
1.1.1 ≤ v < 2.0.0
Affected range stops below 2.0.0, so it looks safe — our inference, not a vendor statement
Marked· Markedjsnpm
60%
v < 2.0.0
Affected range stops below 2.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (5)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/markedjs/marked/commit/7293251c438e3ee968970f7609f1a27f9007bccd
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/markedjs/marked/issues/1927
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/markedjs/marked/pull/1864
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/markedjs/marked/security/advisories/GHSA-4r62-v4vq-hr96
x_refsource_MISCProductThird Party Advisory
Source: [email protected]
https://www.npmjs.com/package/marked

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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