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9.8
CVE-2026-73649: Velocity.js: Malicious Code Can Run on Your Server
CVE-2026-73649 · published 21 days ago
Summary
A vulnerability in Velocity.js, a JavaScript templating engine, allows an attacker to inject and run malicious code on your server if you're using a version prior to 2.1.7. This is particularly concerning if your application uses Velocity to render templates that are controlled by users. To protect yourself, update to the latest version of Velocity.js.
What to do
- Update shepherdwind velocityjs to version 2.1.7.
- Update velocityjs to version 2.1.7.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| npm | shepherdwind | velocityjs |
<= 2.1.6 < 2.1.7 Fix: upgrade to 2.1.7
|
| – | shepherdwind | velocity.js | < 2.1.7 |
| npm | – | velocityjs |
<= 2.1.6 Fix: upgrade to 2.1.7
|
Original advisory text
Velocity.js: Remote Code Execution via property-read to Function constructor (bypass of CVE-2026-44966 fix)
Velocity.js is a JavaScript implementation of the Apache Velocity template engine. Prior to 2.1.7, the earlier fix for CVE-2026-44966 filtered constructor, __proto__, and prototype only in the #set assignment handler in src/compile/set.ts, while property-read expressions in src/compile/references.ts remained unfiltered. The getReferences() flow called getAttributes(), whose property access allowed an attacker-controlled template to traverse constructor.constructor to the JavaScript Function constructor. The #set handler validated only the assignment target and did not inspect the right-hand property-read expression, allowing arbitrary shell commands, environment-variable access, cloud-credential access, and internal-network access in the server process. This issue is fixed in version 2.1.7.
References
- https://github.com/shepherdwind/velocity.js/security/advisories/GHSA-7gfh-x38p-p...
- https://github.com/shepherdwind/velocity.js/pull/192
- https://github.com/shepherdwind/velocity.js/commit/f8e47a6c4607249b9c967d3a1ced9...
- https://github.com/shepherdwind/velocity.js/releases/tag/v2.1.7
- https://github.com/advisories/GHSA-7gfh-x38p-prh3
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73649... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-73649 Vendor Advisory
- https://github.com/shepherdwind/velocity.js Product
Severity
9.8
Critical
CVSS 3.1: 9.8 (GHSA)
CVSS 3.1: 9.8 (MITRE)
Exploitation
EPSS <1%
Type
CWE-94Code Injection
Timeline
Published13 Aug 2026
Updated2 Sep 2026
First seen24 Jul 2026
Sources
CVE-2026-73649 · MITRE
CVE-2026-73649 · NVD
GHSA-7gfh-x38p-prh3 · OSV
GHSA-7gfh-x38p-prh3 · GHSA
CVE-2026-73649 · OSV
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