Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+We're extremely grateful for security researchers and users who report vulnerabilities they discovered in YDB. All reports are thoroughly investigated.
+
+To report a potential vulnerability in YDB please email details to [[email protected]](mailto:[email protected]).
+
+### When Should I Report a Vulnerability?
+
+- You think you discovered a potential security vulnerability in YDB
+- You are unsure how a vulnerability affects YDB
+
+## Security Vulnerability Response
+
+Each report is acknowledged and analyzed by YDB maintainers within 5 working days.
+We will keep the reporter informed about the issue progress.
+
+## Public Disclosure Timing
+
+A public disclosure date is negotiated by YDB maintainers and the bug submitter. 
+We prefer to fully disclose the bug as soon as possible once a mitigation is available for YDB users. 
+It is reasonable to delay disclosure when the bug or the fix is not yet fully understood, 
+the solution is not well-tested, or for vendor coordination. 
+The timeframe for disclosure is from immediate (especially if it's already publicly known) to 90 days. 
+For a vulnerability with a straightforward mitigation, we expect report date to disclosure date to be on the order of 7 days.