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Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_M

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

High 8.2

In plain English

A high-severity cross-site scripting in svgo from svg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.5%top 55.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14node-svgo3.3.5+ds-1DEBIAN-CVE-2026-84370
npmsvgo2.8.4GHSA-w27v-7q3p-w38r
npmsvgo3.3.5GHSA-w27v-7q3p-w38r
npmsvgo4.1.0GHSA-w27v-7q3p-w38r

Affected products (as reported)

VendorProductVersions
svg svgo >= 1.0.0, < 2.8.4>= 3.0.0, < 3.3.5>= 4.0.0, < 4.1.0

Weakness: CWE-79, CWE-184 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References