by Kastro
Paper/Archive/CVE-2026-44966

CVE-2026-44966

shepherdwind velocity.js — Velocity.js: Prototype Pollution in #set path assignment

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 45.8.458 × 209.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
velocity.js<= 2.1.5–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)8.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/shepherdwind/velocity.js/security/advisories/GHSA-j658-c2gf-x6pq