What’s Vulnerable › Vulnerabilities

CVE-2020-26310: GHSL-2020-305: Regular Expression Denial of Service (ReDoS) in Pure JavaScript HTML5 Parser

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-26 · updated 2026-06-17
• Weakness: CWE-1333

Description

Validate.js provides a declarative way of validating javascript objects. All versions as of 30 November 2020 contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, it is unknown if any patches are available.

Affected products

• blowsie Pure Javascript Html5 Parser: all versions

References

• https://github.com/blowsie/Pure-JavaScript-HTML5-Parser/issues/14
• https://securitylab.github.com/advisories/GHSL-2020-305-redos-Pure-JavaScript-HTML5-Parser/

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