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CVE-2015-8855

21
FAUCET Score

CVE-2015-8855 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the semver package for Node.js, specifically versions prior to 4.3.2. An attacker can exploit this by providing a crafted, long version string, leading to high CPU consumption and a denial of service. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with no user interaction, though it only impacts availability. There is no evidence of active exploitation, public exploit code, or inclusion in the KEV catalog, and community discussion and media coverage are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3.1CPE matchmatch criteria
cpe:2.3:a:nodejs:node.js:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.49%
Probability of exploitation in next 30 days
EPSS Percentile
93.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0649 is in the 88th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: semverFixed in: 4.3.2
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: nodejs010-nodejs-semver

Vendor Advisories (2)

npmGHSA-x6fg-f45m-jf5qhigh

Regular Expression Denial of Service in semver

Oct 24, 2017
redhatCVE-2015-8855Moderate

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

Apr 3, 2015

References

nodesecurity.io / advisories/31
PatchVendor Advisory
openwall.com / lists/oss-security/2016/04/20/11
Mailing ListThird Party Advisory
securityfocus.com / bid/86957
Third Party AdvisoryVDB Entry