What’s Vulnerable › Vulnerabilities

CVE-2021-23490: Regular Expression Denial of Service (ReDoS)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-24 · updated 2026-06-17
• Weakness: CWE-1333

Description

The package parse-link-header before 2.0.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via the checkHeader function.

Affected products

• parse-link-header: before 2.0.0 — fixed in 2.0.0

How to fix

Upgrade to a fixed version: parse-link-header 2.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/thlorenz/parse-link-header/commit/72f05c717b3f129c5331a07bf300ed8886eb8ae1
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2321973
• https://snyk.io/vuln/SNYK-JS-PARSELINKHEADER-1582783
• https://github.com/thlorenz/parse-link-header/commit/72f05c717b3f129c5331a07bf300ed8886eb8ae1
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2321973
• https://snyk.io/vuln/SNYK-JS-PARSELINKHEADER-1582783

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