Description
The semver package before 4.3.2 for Node.js allows attackers to cause a denial of service (CPU consumption) via a long version string, aka a "regular expression denial of service (ReDoS)."
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-semver | 5.3.0-1 | — |
| Debian 13 | node-semver | 5.3.0-1 | — |
| Debian 12 | node-semver | 5.3.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | node-semver | 2.1.0-2ubuntu0.1~esm1 | USN-4776-1 |
| Ubuntu Pro 14.04 LTS | node-semver | 2.1.0-2ubuntu0.0.1~esm1 | USN-4776-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | semver | >= 1.0.4, < 4.3.2 | 4.3.2 | GHSA-x6fg-f45m-jf5q |
Advisories 1
- USN-4776-1 node-semver vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026