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GHSA-7gfh-x38p-prh3: Velocity.js: Remote Code Execution via property-read to Function constructor (bypass of GHSA-j658-c2gf-x6pq fix)

July 24, 2026

Remote Code Execution (RCE) in velocityjs v2.1.6 via property-read to the Function constructor. This bypasses the fix for GHSA-j658-c2gf-x6pq (“Prototype Pollution in #set path assignment”) — that advisory blocked constructor/proto/prototype only in the #set assignment handler (set.cjs), but property read expressions are unfiltered. Any application rendering attacker-controlled Velocity templates is vulnerable to arbitrary code execution on the server.

References

  • github.com/advisories/GHSA-7gfh-x38p-prh3
  • github.com/shepherdwind/velocity.js/commit/f8e47a6c4607249b9c967d3a1ced959b4dd64dba
  • github.com/shepherdwind/velocity.js/pull/192
  • github.com/shepherdwind/velocity.js/releases/tag/v2.1.7
  • github.com/shepherdwind/velocity.js/security/advisories/GHSA-7gfh-x38p-prh3

Code Behaviors & Features

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Affected versions

All versions before 2.1.7

Fixed versions

  • 2.1.7

Solution

Upgrade to version 2.1.7 or above.

Impact 9.8 CRITICAL

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

Learn more about CVSS

Weakness

  • CWE-94: Improper Control of Generation of Code ('Code Injection')

Source file

npm/velocityjs/GHSA-7gfh-x38p-prh3.yml

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