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Fencer Intel
high 7.5

CVE-2015-8855 json

Regular Expression Denial of Service in semver

published 9y ago modified 4mo ago also GHSA-x6fg-f45m-jf5q , EUVD-2017-0328

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.9%
EPSS 6.9% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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)."

Patch / fix

  • npm semver 4.3.2
  • node-semver Debian 14, Debian 13, Debian 12 5.3.0-1

debian advisories DEBIAN-CVE-2015-8855

  • node-semver Ubuntu Pro 14.04 LTS 2.1.0-2ubuntu0.0.1~esm1
  • node-semver Ubuntu Pro 16.04 LTS 2.1.0-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2015-8855

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2015-8855 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8855 updated cvss 4.3

nodejs-semver: npm Regular Expression Denial of Service during package versions parsing

  • Red Hat Software Collections nodejs010-nodejs-semver
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.89% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm semver
>=1.0.4, <4.3.2
4.3.2

Classification

Weakness
  • CWE-399 Resource Management Errors
  • CWE-1333 Inefficient Regular Expression Complexity
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.