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CVE-2019-19919

34
FAUCET Score

CVE-2019-19919 is a critical Prototype Pollution vulnerability in Handlebars.js versions prior to 4.3.0, affecting products like Tenable.sc. This flaw allows attackers to manipulate object prototypes and execute arbitrary code via crafted payloads, posing a severe risk with a CVSS score of 9.8. While no public exploit code or active exploitation has been confirmed, the vulnerability has garnered some community discussion, indicating awareness of its potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.6CPE matchmatch criteria
cpe:2.3:a:handlebars.js_project:handlebars.js:1.0.6:-:*:*:*:node.js:*:*
1.0.7CPE matchmatch criteria
cpe:2.3:a:handlebars.js_project:handlebars.js:1.0.7:-:*:*:*:node.js:*:*
1.0.8CPE matchmatch criteria
cpe:2.3:a:handlebars.js_project:handlebars.js:1.0.8:-:*:*:*:node.js:*:*
1.0.9CPE matchmatch criteria
cpe:2.3:a:handlebars.js_project:handlebars.js:1.0.9:-:*:*:*:node.js:*:*
1.0.10CPE matchmatch criteria
cpe:2.3:a:handlebars.js_project:handlebars.js:1.0.10:-:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.07%
Probability of exploitation in next 30 days
EPSS Percentile
93.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0707 is in the 89th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

npmpatch availablevia ghsa
Product: handlebarsFixed in: 4.3.0
npmpatch availablevia ghsa
Product: handlebarsFixed in: 3.0.8
redhatpatch availablevia redhat_api
Product: RHPAM 7.13.1 asyncFixed in: handlebars
View patch
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: kibana
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: kibana
redhatno patchvia redhat_api
Product: Red Hat Quay 3Fixed in: nodejs-handlebars

Vendor Advisories (2)

npmGHSA-w457-6q6x-cgp9critical

Prototype Pollution in handlebars

Dec 26, 2019
redhatCVE-2019-19919Low

nodejs-handlebars: prototype pollution leading to remote code execution via crafted payloads

Sep 24, 2019

References

npmjs.com / advisories/1164
Third Party Advisory
tenable.com / security/tns-2021-14
PatchThird Party Advisory