What’s Vulnerable › Vulnerabilities

CVE-2021-43307: Exponential ReDoS in semver-regex

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-02 · updated 2026-06-17
• Weakness: CWE-1333

Description

An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the semver-regex npm package, when an attacker is able to supply arbitrary input to the test() method

Affected products

• semver-regex: before 3.1.4; from 4.0.0 before 4.0.3 — fixed in 3.1.4, 4.0.3

How to fix

Upgrade to a fixed version: semver-regex 3.1.4, 4.0.3. Check the vendor advisory for mitigations.

References

• https://research.jfrog.com/vulnerabilities/semver-regex-redos-xray-211349/
• https://research.jfrog.com/vulnerabilities/semver-regex-redos-xray-211349/

Get alerted when CVE-2021-43307 or the next vulnerability affects your stack