HOMEVULNERABILITIESCVE-2019-19919
CRITICAL

CVE-2019-19919

CWE-1321Published: December 20, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.

NVD Source

Technical Analysis

CVE-2019-19919 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

handlebars.js_project1 product(s)
handlebars.js
tenable1 product(s)
tenable.sc
Source: NVD CPE · 44 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.tenable.com/security/tns-2021-14
PATCHhttps://www.tenable.com/security/tns-2021-14
ADVISORYhttps://www.npmjs.com/advisories/1164
ADVISORYhttps://www.npmjs.com/advisories/1164

All References (4)

→
https://www.npmjs.com/advisories/1164Third Party Advisory
→
https://www.tenable.com/security/tns-2021-14Patch · Third Party Advisory
→
https://www.npmjs.com/advisories/1164Third Party Advisory
→
https://www.tenable.com/security/tns-2021-14Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2019-19919
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-1321
CISA KEVNo
Affected2 vendor(s)
PublishedDec 20, 2019

Related CVEs (CWE-1321)

CVE-2026-25881
10.0
CVE-2021-23594
10.0
CVE-2023-26121
10.0
CVE-2026-25150
10.0
CVE-2024-38999
10.0
CVE-2021-23449
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-19919 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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