CVE-2026-30852
Description
A flaw was found in Caddy, an extensible server platform. The vars_regexp matcher in Caddy's HTTP module double-expands user-controlled input. A remote attacker can exploit this by injecting specific placeholders into request headers, leading to information disclosure. This allows the attacker to leak sensitive data such as environment variables, file contents, and system information.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
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