HTML Meta Tag Vulnerability in Go Programming Language

CVE-2026-27142

What is CVE-2026-27142?

The vulnerability arises from improper handling of URLs within the content attribute of HTML meta tags in the Go programming language. When an action inserts a URL that is not escaped, it poses a risk for XSS attacks, especially if the meta tag includes an http-equiv attribute set to 'refresh'. This issue can lead to unintended consequences, allowing attackers to execute arbitrary scripts in the context of a user's browser session. A new GODEBUG setting, htmlmetacontenturlescape, has been introduced to control the escaping behavior for URLs, providing developers with an option to mitigate the risk.

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References