# CVE-2025-66648: vega.js: vega-functions provides function implementations for the Vega expression language

CVE-2025-66648 is fixed in vega.js on 1 platform by DEBIAN-CVE-2025-66648 (version 5.33.1+ds+~cs5.3.0-2), released January 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-66648
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 5, 2026

## Description

vega-functions provides function implementations for the Vega expression language. Prior to version 6.1.1, for sites that allow users to supply untrusted user input, malicious use of an internal function (not part of the public API) could be used to run unintentional javascript (XSS). This issue is fixed in vega-functions `6.1.1`. There is no workaround besides upgrading. Using `vega.expressionInterpreter` as described in CSP safe mode does not prevent this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | vega.js Debian 14 | 5.33.1+ds+~cs5.3.0-2 | [DEBIAN-CVE-2025-66648](https://patchblox.com/security/data/fix/linux/debian-cve-2025-66648.md) | Jan 5, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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