🛡️ CVE-2021-43307 — semver-regex

🟢 CVSS 2.0 — Low ✅ No Known Exploit CWE-1333 OSV
2.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Regular expression denial of service in semver-regex

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

Weakness class

CVE-2021-43307 is classified as CWE-1333: Inefficient Regular Expression Complexity. A regular expression backtracks catastrophically on crafted input, consuming CPU out of proportion to input size.

Affected software

CVE-2021-43307 is recorded against 1 package.

  • semver-regex

Timeline and source

Published on 3 June 2022 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
research.jfrog.com (Web)

CVE-2021-43307 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 2.0
CVSS Vector N/A
CWE CWE-1333
Public Exploit ✅ No
Source OSV
Published 2022-06-03
Updated 2026-08-12
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
semver-regex — —

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