CyberRota Analysis
AI-GeneratedHttp4s versions prior to 0.23.35 and 1.0.0-M47 are vulnerable to a directory traversal attack due to improper handling of percent-encoded URL path segments, which can allow unauthorized access to resources outside the intended directory. This vulnerability poses a medium risk, particularly for applications serving classpath or WebJar resources, as it could expose sensitive files. Organizations utilizing affected versions should prioritize upgrading to the patched versions to mitigate potential exploitation.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, ResourceService and WebjarService decode each URL path segment but reject only segments exactly equal to an empty string, a dot, or two dots. A request containing percent-encoded slash or backslash separators can turn an accepted segment into a parent-directory traversal after decoding, allowing access to classpath or WebJar resources outside the configured base when a directory-backed classpath is served and the backend preserves the encoded separator. The patch rejects decoded segments containing slash or backslash in ResourceService and WebjarService, and applies the same guard to the non-exploitable FileService for consistency. This issue is fixed in versions 0.23.35 and 1.0.0-M47.