What’s Vulnerable › Vulnerabilities

CVE-2021-23346: Regular Expression Denial of Service (ReDoS)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-04 · updated 2026-06-17

Description

This affects the package html-parse-stringify before 2.0.1; all versions of package html-parse-stringify2. Sending certain input could cause one of the regular expressions that is used for parsing to backtrack, freezing the process.

Affected products

• Html-Parse-Stringify Project Html-Parse-Stringify: before 2.0.1 — fixed in 2.0.1

How to fix

Upgrade to a fixed version: Html-Parse-Stringify Project Html-Parse-Stringify 2.0.1. Check the vendor advisory for mitigations.

References

• https://github.com/HenrikJoreteg/html-parse-stringify/blob/master/lib/parse.js%23L2
• https://github.com/HenrikJoreteg/html-parse-stringify/commit/c7274a48e59c92b2b7e906fedf9065159e73fe12
• https://github.com/rayd/html-parse-stringify2/blob/master/lib/parse.js%23L2
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1080633
• https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY-1079306
• https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY2-1079307
• https://github.com/HenrikJoreteg/html-parse-stringify/blob/master/lib/parse.js%23L2
• https://github.com/HenrikJoreteg/html-parse-stringify/commit/c7274a48e59c92b2b7e906fedf9065159e73fe12
• https://github.com/rayd/html-parse-stringify2/blob/master/lib/parse.js%23L2
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1080633
• https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY-1079306
• https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY2-1079307

Get alerted when CVE-2021-23346 or the next vulnerability affects your stack