# CVE-2025-55166: svg-sanitizer Bypasses Attribute Sanitization

Source: https://junglewise.ai/threats/cve-2025-55166-svg-sanitizer-bypasses-attribute-sanitization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-08-12  
License: CC BY 4.0 with a link back

CVE-2025-55166 · Severity: medium · CVSS 4 · Published 2025-08-12

svg-sanitizer Bypasses Attribute Sanitization

Technologies: [enshrined/svg-sanitize (Packagist)](https://junglewise.ai/threats/technologies/enshrined-svg-sanitize). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2025-55166 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-55166 being exploited in the wild.

**How severe is CVE-2025-55166?** Medium severity, with a CVSS score of 4, published 12 August 2025.

**Which products and versions are affected?** enshrined/svg-sanitize (Packagist) ECOSYSTEM:introduced=0,fixed=0.22.0.

**Is there a fix for CVE-2025-55166?** Yes. enshrined/svg-sanitize (Packagist): upgrade to 0.22.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-55166?** Check whether you run enshrined/svg-sanitize (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- enshrined/svg-sanitize (Packagist): upgrade to 0.22.0 or later

  ```sh
  composer require enshrined/svg-sanitize:^0.22.0
  ```


## Affected products

- enshrined/svg-sanitize (Packagist) ECOSYSTEM:introduced=0,fixed=0.22.0

## Identifiers

- CVE-2025-55166
- GHSA-22wq-q86m-83fh

## Related threats

- [svg-sanitizer case-insensitive xlink:href DoS bypass](https://junglewise.ai/threats/cve-2026-107381-svg-sanitizer-mixed-case-xlink-href-skips-the-use-nesting-dos)
- [enshrined svg-sanitize stored XSS via DTD entity collision](https://junglewise.ai/threats/cve-2026-107380-enshrined-svg-sanitize-stored-xss-via-dtd-entity-html5-named)
- [enshrined svg-sanitize denial of service via DTD attribute declaration](https://junglewise.ai/threats/cve-2026-107379-enshrined-svg-sanitize-denial-of-service-via-dtd-attribute)
- [svg-sanitizer has Cross-site Scripting Bypass](https://junglewise.ai/threats/cve-2023-28426-svg-sanitizer-has-cross-site-scripting-bypass)
- [Cross-site Scripting in enshrined/svg-sanitize](https://junglewise.ai/threats/cve-2022-23638-cross-site-scripting-in-enshrined-svg-sanitize)