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CVE-2016-10539

21
FAUCET Score

CVE-2016-10539 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the negotiator Node.js module, affecting versions 0.6.0 and earlier. This flaw allows an attacker to trigger a denial of service by sending a specially crafted "Accept-Language" header, impacting applications and frameworks that utilize negotiator, such as Express and Koa. Rated with a CVSS score of 7.5 (High), the vulnerability is easily exploitable over the network with low complexity, leading to high availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.6.0CPE matchmatch criteria
cpe:2.3:a:negotiator_project:negotiator:*:*:*:*:*: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
1.40%
Probability of exploitation in next 30 days
EPSS Percentile
69.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0140 is in the 50th percentile among its peer group of 51,485 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 (1)

npmpatch availablevia ghsa
Product: negotiatorFixed in: 0.6.1

Vendor Advisories (1)

npmGHSA-7mc5-chhp-fmc3high

Regular Expression Denial of Service in negotiator

Oct 9, 2018

References

nodesecurity.io / advisories/106
Third Party Advisory