CVE-2026-44966 json
Velocity.js: Prototype Pollution in #set path assignment
published 6mo ago modified 3mo ago also GHSA-j658-c2gf-x6pq , EUVD-2026-32007
- cvss
- 8.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/shepherdwind/velocity.js/security/advisories/GHSA-j658-c2gf-x6pq referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | velocityjs | <=2.1.5 |
no fix listed |
Affected products
- shepherdwind velocity.js
Classification
- Weakness
-
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
References
-
github.com
/shepherdwind/velocity.js/security/advisories/GHSA-j658-c2gf-x6pq
web, exploit, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-44966
advisory
-
github.com
/shepherdwind/velocity.js
package
Sources
- CVE List CVE-2026-44966
- GitHub Advisory GHSA-j658-c2gf-x6pq
- NVD CVE-2026-44966
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