High

Regular Expression Denial of Service in semver

Disclosed: 24.10.2017
Updated: 11.10.2026 10:22

Versions 4.3.1 and earlier of semver are affected by a regular expression denial of service vulnerability when extremely long version strings are parsed.

Recommendation

Update to version 4.3.2 or later

Affected software

Click a technology to see all vulnerabilities affecting it.

Platform	Package	Vulnerable versions	Fixed in
npm package	semver	>= 1.0.4, < 4.3.2	4.3.2

References

CVSS score 7.5/10

CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-1333
Platform: npm
Package: semver
Disclosed: 24.10.2017
Updated: 11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-x6fg-f45m-jf5q - CC BY 4.0

Vulnerability history: semver

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries: 2
First → latest: 10.2017 06.2023
Without a fix: 0
Exploited in attacks: 0

Severity breakdown

High 2

Disclosures per year

2017: 1
2018: 0
2019: 0
2020: 0
2021: 0
2022: 0
2023: 1
2024: 0
2025: 0
2026: 0

21.06.2023

semver vulnerable to Regular Expression Denial of Service

High · 7.5 CVE-2022-25883 >= 7.0.0, < 7.5.2, >= 6.0.0, < 6.3.1, >= 2.0.0-alpha, < 5.7.2 7.5.2, 6.3.1, 5.7.2
24.10.2017

Regular Expression Denial of Service in semver this entry

High · 7.5 CVE-2015-8855 >= 1.0.4, < 4.3.2 4.3.2

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