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Vulnerabilities

Vulnerability · CVE-2026-44966

Velocity.js is a JavaScript implementation of the Apache Velocity template engine.

Published May 26, 2026 · catalog updated Jul 24, 2026 · Velocity.js is a JavaScript

Check if you run it

No confirmed exploitation is on record for CVE-2026-44966. EPSS is 0.61%. Act only if a listed version of Velocity.js is a JavaScript is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Velocity.js is a JavaScript).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.61%
Remediation
Version ranges on file
Affected products
cpe shepherdwind/velocity.js · stated velocity.js

Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a template controlled by an attacker, it is possible to modify Object.prototype, potentially leading to Denial of Service (DoS) or Remote Code Execution (RCE) depending on the server environment.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe shepherdwind/velocity.jsversion unspecified
  • stated velocity.js<= 2.1.5

How to fix CVE-2026-44966

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-44966. EPSS is 0.61%. Act only if a listed version of Velocity.js is a JavaScript is installed.

Which versions are affected?

Compare what you have installed with <= 2.1.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). EPSS 0.61%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 26, 2026 · NIST NVD

    Detected

    Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a template controlled by an attacker, it is possible to modify Object.prototype, potentially leading to Denial of Service

  2. Jul 24, 2026 · NIST NVD

    Updated

    Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a template controlled by an attacker, it is possible to modify Object.prototype, potentially leading to Denial of Service

Sources

  • CVE.orgVulnerability recordCVE-2026-44966

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-44966

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-44966

    Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.