Symbolicator is a symbolication service for native stacktraces and minidumps with symbol server support. An attacker could make Symbolicator send arbitrary GET HTTP requests to internal IP addresses by using a specially crafted HTTP endpoint. The response could be reflected to the attacker if they have an account on Sentry instance. The issue has been fixed in the release 23.11.2.
https://github.com/getsentry/symbolicator/security/advisories/GHSA-6576-pr6j-h9c6
https://github.com/getsentry/symbolicator/releases/tag/23.11.2
https://github.com/getsentry/symbolicator/pull/1332
https://github.com/getsentry/symbolicator/commit/9db2fb9197dd200d62aacebd8efef4df7678865a