Vulnerability Information
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Unhead has a hasDangerousProtocol() bypass via leading-zero padded HTML entities in useHeadSafe()
Vulnerability Description
Unhead is a document head and template manager. Prior to 2.1.13, useHeadSafe() is the composable that Nuxt's own documentation explicitly recommends for rendering user-supplied content in <head> safely. Internally, the hasDangerousProtocol() function in packages/unhead/src/plugins/safe.ts decodes HTML entities before checking for blocked URI schemes (javascript:, data:, vbscript:). The decoder uses two regular expressions with fixed-width digit caps. The HTML5 specification imposes no limit on leading zeros in numeric character references. When a padded entity exceeds the regex digit cap, the decoder silently skips it. The undecoded string is then passed to startsWith('javascript:'), which does not match. makeTagSafe() writes the raw value directly into SSR HTML output. The browser's HTML parser decodes the padded entity natively and constructs the blocked URI. This vulnerability is fixed in 2.1.13.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Vulnerability Type
不完整的黑名单
Vulnerability Title
unhead 安全漏洞
Vulnerability Description
unhead是UnJS开源的一个文档头和模板管理器。 Unhead 2.1.13之前版本存在安全漏洞，该漏洞源于解码HTML实体时存在正则表达式限制，可能导致跨站脚本攻击。
CVSS Information
N/A
Vulnerability Type
N/A