CVE-2022-21222: The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the us

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MEDIUM 5.3REMOTEUPGRADE

CVE-2022-21222 is a medium-severity flaw (CVSS 5.3) affecting css-what. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-1333
Published	2022-09-30
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: css-what project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-30 05:15 UTCPublished CVE record published
2026-06-17 04:25 UTCUpdated Record last modified

css-what project css-what UPGRADE

Affected: < 2.1.3

Fixed in: 2.1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls css-what

2. UPGRADE to 2.1.3

npm install css-what@">=2.1.3"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-21222?

css-what: upgrade to 2.1.3. Exact commands for each OS are on this page.

Is CVE-2022-21222 being exploited?

CVE-2022-21222 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-21222 affect?

CVE-2022-21222 affects css-what. Severity is medium (CVSS 5.3). The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered

How urgent is CVE-2022-21222?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-33587 HIGH 7.5 DOWNGRADE MITIGATE The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Co

References

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