RFC 9116 Informational

A File Format to Aid in Security Vulnerability Disclosure

E. Foudil, Y. Shafranovich · 2022-04

Abstract

When an organization discovers a vulnerability in a product or system they use, they may need to know how to report it to the relevant party. Similarly, when a researcher or pen tester discovers a vulnerability in a product or system, they may need to report it to the appropriate organization. This document defines a file format ('security.txt') to help organizations describe their vulnerability disclosure practices.

Why This RFC Matters

RFC 9116 standardized security.txt, a simple text file placed at /.well-known/security.txt that allows organizations to publish their vulnerability disclosure policy, contact information (including PGP-encrypted email), bug bounty program link, and preferred languages for security reports. Before this standard, security researchers often struggled to find the right channel to responsibly disclose vulnerabilities, leading to delays or public disclosure out of frustration. Adoption has grown significantly since IANA registration, with large technology companies, government agencies, and open-source projects publishing security.txt files — the file is now checked by automated vulnerability disclosure tooling and is a recommended practice in NIST and ENISA guidelines.

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