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Serializing SVG does not execute JavaScript by itself. The danger comes later, if attacker-controlled SVG is parsed or inserted in a context that activates its scripts, event handlers, or other browser features. Once active in a page, malicious SVG code may read sensitive data available to that page and send it elsewhere, subject to the page’s origin and security policies.
What SVG serialization does—and does not do
Serialization converts a document or DOM into markup, often so an application can store, transport, template, or display it. If the SVG contains a <script> element, an event-handler attribute such as onclick, or other active content, serialization can preserve that content in the resulting string. The conversion itself does not run it.
The security-relevant transition is when that string is parsed or inserted in a context that permits the SVG’s active features. A string that looks like harmless markup while stored can become executable when a page interprets it as live content.
When can SVG scripts run?
SVG supports script elements and event-handler attributes, but whether they execute depends on how the browser processes the SVG. The W3C SVG 2 specification distinguishes dynamic interactive processing, which permits scripts and external references, from secure processing modes that disable script execution and external references. Secure static mode also disables animation and interaction.
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| Processing context | Scripts | External references | Interaction and page context |
|---|---|---|---|
| Dynamic interactive SVG | Permitted | Permitted | Interactive processing; behavior depends on how the SVG is embedded and the browser’s processing context. |
| Secure animated mode | Disabled | Disabled | Animation may remain; it is not the same as dynamic interactive processing. |
| Secure static mode | Disabled | Disabled | Animation and interaction are disabled. |
That distinction is why “SVG is safe as an image” is too broad. An image-oriented embedding can use constrained processing, while inline SVG or insertion into an active document may expose a different set of behaviors. Assess the actual browser context and embedding path rather than relying on the file extension or the fact that the content is SVG.
Is DOMParser safe for SVG?
DOMParser.parseFromString(svg, "image/svg+xml") parses SVG as XML and creates a separate document. MDN describes the parsed document as effectively inert: its scripts and event handlers do not run immediately. But parsing is not sanitization. MDN warns that “event handlers and scripts in its DOM will be able to run if they are inserted into the visible DOM.”
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So, checking that the document parses or is well-formed does not make its contents safe. If an application imports nodes from the parsed document and appends them to the live page, that movement can activate content that was inert in the separate document.
How can activated SVG leak data?
If hostile SVG code executes in a web page, it can act with the access available to script running in that page. Depending on the page’s origin, data accessible to the page may include rendered account information, form inputs, or application data. The code may then attempt to transmit collected information through browser request mechanisms.
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This does not mean that serializing SVG gives code access to browser secrets, or that every SVG can read arbitrary data from every site. The impact depends on whether the code becomes active, what the victim page exposes, and restrictions such as the same-origin policy and Content Security Policy (CSP).
Examples from security advisories
A GitHub Advisory Database report published March 18, 2026, describes malicious SVG content entering through templates in @pdfme/schemas and being inserted with innerHTML. Reported impacts include session or token theft, keylogging of form inputs, phishing through page modification, and data exfiltration. The advisory assigns that specific vulnerability a CVSS v3 base score of 6.1 (Moderate); that is not a general risk score for SVG.
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An Angular security advisory documents a different route: user-controlled href or xlink:href bindings on SVG <script> elements were treated as ordinary strings rather than resource URLs. The reported payloads could use data:text/javascript or an external script. The advisory lists patched versions 19.2.18, 20.3.16, 21.0.7, and 21.1.0-rc.0; consult Angular’s advisory for current release-line guidance, since version information can change.
How to handle untrusted SVG safely
1. Use text output when the content is meant to be text
If the intended result is to display a string, insert it as text with textContent or an equivalent text-output mechanism. Do not route untrusted text through an HTML insertion sink such as innerHTML. OWASP advises against using innerHTML with untrusted data and recommends text output for text-only updates.
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2. Sanitize SVG before it reaches a live document
If users must provide SVG, use a maintained sanitizer and define an allowlist of the SVG features the application actually needs. Remove executable elements and event-handler attributes, and restrict URL-bearing attributes and external references to match the required feature set. A hand-written blacklist is easy to miss because active content can appear in less obvious markup and URL contexts.
Sanitize before importing, appending, or otherwise inserting nodes into the active page. Treat DOMParser as a parsing tool—not as a security boundary.
3. Reduce injection sinks and enforce Trusted Types where available
Review every route that can turn a string or parsed node into live DOM, including innerHTML, outerHTML, insertAdjacentHTML, document writing, template renderers, framework bindings, SVG script URL attributes, and moving nodes out of an inert parsed document.
Trusted Types enforcement using require-trusted-types-for can make dangerous DOM injection sinks auditable and require a trusted transformation before those sinks accept content. Trusted Types is an enforcement framework, not a sanitizer: the transformation still needs to sanitize correctly.
4. Use CSP as defense in depth
A restrictive CSP can limit the impact of a mistake, including constraining script execution and outbound requests. It is a backup layer, not a replacement for input validation, sanitization, and safe output handling. Policy coverage matters: the CSP specification notes that a policy without default-src does not cover every request type, and a permissive directive can reopen an exfiltration route.
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