CVE-2022-37620 — A Regular Expression Denial of Service (ReDoS) flaw was found in kangax html-min

A Regular Expression Denial of Service (ReDoS) flaw was found in kangax html-minifier 4.0.0 because of the reCustomIgnore regular expression.

01What is this vulnerability?

A Regular Expression Denial of Service (ReDoS) flaw was found in kangax html-minifier 4.0.0 because of the reCustomIgnore regular expression.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-10-31T00:00:00.000Z
• Last modified: 2025-06-01T13:26:16.095Z

09References

• github.com — https://github.com/kangax/html-minifier/blob/51ce10f4daedb1de483ffbcccecc41be1c8…
• github.com — https://github.com/kangax/html-minifier/blob/51ce10f4daedb1de483ffbcccecc41be1c8…
• github.com — https://github.com/kangax/html-minifier/issues/1135
• security.snyk.io — https://security.snyk.io/vuln/SNYK-JS-HTMLMINIFIER-3091181