Velocity.js: Remote Code Execution via property-read to Function constructor (bypass of CVE-2026-44966 fix)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73649
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 18:18:20 UTC
Updated2026-08-13 18:18:20 UTC
DescriptionVelocity.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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

Problem Types: CWE-94 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Shepherdwind Velocity.js affected < 2.1.7 Not specified

References

ReferenceSourceLinkTags
github.com/shepherdwind/velocity.js/commit/f8e47a6c4607249b9c967d3a1ced9... [email protected] github.com
github.com/shepherdwind/velocity.js/security/advisories/GHSA-7gfh-x38p-prh3 [email protected] github.com
github.com/shepherdwind/velocity.js/pull/192 [email protected] github.com
github.com/shepherdwind/velocity.js/releases/tag/v2.1.7 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
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