[Docs] Document vulnerability disclosure process (vllm-project#12326)

Signed-off-by: Russell Bryant <[email protected]>

docs/source/contributing/vulnerability_management.md

@@ -41,3 +41,20 @@ You may use the `#security` channel in the [VLLM Slack](https://slack.vllm.ai)
 to discuss security-related topics. However, please do not disclose any
 vulnerabilities in this channel. If you need to report a vulnerability, please
 use the GitHub security advisory system or contact a VMT member privately.
+
+## Vulnerability Disclosure
+
+The process for disclosing vulnerabilities is the following:
+
+- The VMT will work with the project maintainers to develop a fix for the
+  vulnerability.
+- The VMT will coordinate with the reporter and project maintainers to prepare a
+  security advisory that adequately describes the vulnerability and its impact.
+- The VMT will coordinate with the project maintainers to publish a fix and
+  release an update that includes that fix.
+- The VMT will publish the security advisory on GitHub. Release notes will be
+  updated to include a reference to the security advisory.
+
+The VMT and project maintainers will work to minimize the amount of time in
+between disclosing any public information about the vulnerability and making a
+release and advisory available.