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CVE-2016-3956

27
FAUCET Score

CVE-2016-3956 describes a vulnerability in the npm CLI, affecting versions before 2.15.1 and 3.x before 3.8.3, as well as specific Node.js versions. This flaw causes npm to inadvertently send bearer tokens in Authorization headers to arbitrary remote HTTP servers, potentially exposing sensitive information. Rated as High severity with a CVSS score of 7.5, the vulnerability is easily exploitable over the network with no user interaction required, leading to a high impact on confidentiality. Despite its severity, there is no evidence of active exploitation, public exploit code, or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.1.0.20CPE matchmatch criteria
cpe:2.3:a:ibm:sdk:*:*:*:*:*:nodejs:*:*
<= 1.2.0.10CPE matchmatch criteria
cpe:2.3:a:ibm:sdk:*:*:*:*:*:nodejs:*:*
<= 4.4.1.0CPE matchmatch criteria
cpe:2.3:a:ibm:sdk:*:*:*:*:*:nodejs:*:*
0.10.0CPE matchmatch criteria
cpe:2.3:a:nodejs:node.js:0.10.0:*:*:*:*:*:*:*
0.10.1CPE matchmatch criteria
cpe:2.3:a:nodejs:node.js:0.10.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.75%
Probability of exploitation in next 30 days
EPSS Percentile
93.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0675 is in the 89th percentile among its peer group of 51,466 CVEs.

Social Chatter

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

No media coverage found for this CVE.

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 (4)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: npmFixed in: 2.15.1
npmpatch availablevia ghsa
Product: npmFixed in: 3.8.3
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: nodejs010-npm

Vendor Advisories (2)

npmGHSA-m5h6-hr3q-22h5high

npm Token Leak in npm

Jul 31, 2018
redhatCVE-2016-3956Moderate

npm: bearer token leak to non-registry hosts

Mar 31, 2016

References

blog.npmjs.org / post/142036323955/fixing-a-bearer-token-vulnerability
Vendor Advisory
github.com / npm/npm/commit/f67ecad59e99a03e5aad8e93cd1a086ae087cb29
PatchThird Party Advisory
github.com / npm/npm/commit/fea8cc92cee02c720b58f95f14d315507ccad401
PatchThird Party Advisory
github.com / npm/npm/issues/8380
Third Party Advisory
nodejs.org / en/blog/vulnerability/npm-tokens-leak-march-2016
Vendor Advisory
www-01.ibm.com / support/docview.wss
Vendor Advisory