CVE-2022-21670

mediumpriority · track · 22EPSS 0.023 · 83 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.28% (83rd) EPSS

CVSS 5 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

markdown-it is a Markdown parser. Prior to version 1.3.2, special patterns with length greater than 50 thousand characterss could slow down the parser significantly. Users should upgrade to version 12.3.2 to receive a patch. There are no known workarounds aside from upgrading.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · security-advisories@github.comexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1333USprimaryCWE-1333USCWE-400USCWE-400US

affected products (3)

Products and version ranges known to be affected.

markdown-it markdown-it≤ < 12.3.2enisa_euvdEU
markdown-it project markdown-it≤ 12.3.1nvdUScpe:2.3:a:markdown-it_project:markdown-it:*:*:*:*:*:*:*:*
npm markdown-it< 12.3.2osvUSpkg:npm/markdown-it

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-6vfc-qv3f-vr6cUncontrolled Resource Consumption in markdown-it2022-01-12ghsa · osvUS
### Impact Special patterns with length > 50K chars can slow down parser significantly. ```js const md = require('markdown-it')(); md.render(`x ${' '.repeat(150000)} x \nx`); ``` ### Patches Upgrade to v12.3.2+ ### Workarounds No. ### References Fix + test sample: https://github.com/markdown-it/markdown-it/commit/ffc49ab46b5b751cd2be0aabb146f2ef84986101

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2022-01-10modified 2026-06-17

related (604)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2023-3364US	high7.5	44.5% (99th)	—	2023-08-02
An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.14 before 16.0.8, all versions starting from 16.1 before 16.1.3, all versions starting from 16.2…
CVE-2022-24713US	high7.5	14.5% (97th)	Exploit	2022-03-08
regex is an implementation of regular expressions for the Rust language. The regex crate features built-in mitigations to prevent denial of service attacks caused by untrusted rege…
CVE-2024-8124US	high7.5	40.2% (99th)	—	2024-09-12
An issue was discovered in GitLab CE/EE affecting all versions starting from 16.4 prior to 17.1.7, starting from 17.2 prior to 17.2.5, starting from 17.3 prior to 17.3.2 which cou…
CVE-2021-3749US	high7.5	8.52% (95th)	Exploit	2021-08-31
axios is vulnerable to Inefficient Regular Expression Complexity
CVE-2024-25126US	high7.5	35.4% (98th)	—	2024-02-29
Rack is a modular Ruby web server interface. Carefully crafted content type headers can cause Rack’s media type parser to take much longer than expected, leading to a possible deni…

+599 more

references (7)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan