Improper Neutralization of Equivalent Special Elements Affecting github.com/vapor/leaf-kit package, versions <1.4.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SWIFT-VAPORLEAFKIT-15325874
- published23 Feb 2026
- disclosed19 Feb 2026
- creditBrian Wolff
Introduced: 19 Feb 2026
NewCVE-2026-27120 (opens in a new tab)How to fix?
Upgrade vapor/leaf-kit to version 1.4.1 or higher.
Overview
vapor/leaf-kit is an an expressive, performant, and extensible templating language built for Swift.
Affected versions of this package are vulnerable to Improper Neutralization of Equivalent Special Elements in the htmlEscaped() function. An attacker can inject malicious HTML or JavaScript into rendered attributes by crafting input that bypasses character escaping using extended grapheme clusters.