CVE-2026-3312
Description
A flaw was found in Pagure's rendering engine for reStructuredText (RST) files. An authenticated user can exploit an unrestricted .. include:: directive within RST files to read arbitrary internal files from the server hosting Pagure. This information disclosure vulnerability allows unauthorized access to sensitive data on the server.
Statement
This vulnerability in Pagure's reStructuredText (RST) rendering engine allows an authenticated user to read arbitrary internal files from the server. This is due to the .. include:: directive in the docutils library not being restricted or jailed during the rendering process within Pagure. Exploitation requires an authenticated user to craft a malicious RST file.
Mitigation
To mitigate this vulnerability, restrict authenticated access to the Pagure instance to only trusted and authorized users. This operational control limits the attack surface by ensuring that only privileged individuals can interact with the vulnerable reStructuredText rendering engine. Implement strong authentication and authorization policies for Pagure users to minimize unauthorized access.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
The attacker may be able to create or overwrite critical files that are used to execute code, such as programs or libraries.
Integrity
Technical Impact: Modify Files or Directories
The attacker may be able to overwrite or create critical files, such as programs, libraries, or important data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, appending a new account at the end of a password file may allow an attacker to bypass authentication.
Confidentiality
Technical Impact: Read Files or Directories
The attacker may be able read the contents of unexpected files and expose sensitive data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, by reading a password file, the attacker could conduct brute force password guessing attacks in order to break into an account on the system.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
The attacker may be able to overwrite, delete, or corrupt unexpected critical files such as programs, libraries, or important data. This may prevent the product from working at all and in the case of protection mechanisms such as authentication, it has the potential to lock out product users.
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