What’s Vulnerable › Vulnerabilities

CVE-2021-3795: Inefficient Regular Expression Complexity in sindresorhus/semver-regex

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-15 · updated 2026-06-17
• Weakness: CWE-1333

Description

semver-regex is vulnerable to Inefficient Regular Expression Complexity

Affected products

• semver-regex: before 3.1.3; 4.0.0 — fixed in 3.1.3

How to fix

Upgrade to a fixed version: semver-regex 3.1.3. Check the vendor advisory for mitigations.

References

• https://github.com/sindresorhus/semver-regex/commit/11c66245f4e1976dccc52977ed183696a21a3fd7
• https://huntr.dev/bounties/006624e3-35ac-448f-aab9-7b5183f30e28
• https://github.com/sindresorhus/semver-regex/commit/11c66245f4e1976dccc52977ed183696a21a3fd7
• https://huntr.dev/bounties/006624e3-35ac-448f-aab9-7b5183f30e28

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