{"id":"GHSA-rc3f-4j82-cmrg","aliases":["RUSTSEC-2026-0413"],"status":"published","title":"Use-after-free of caller-owned server name in client connection constructors","description":"In rustls-ffi 0.12.0 through 0.15.6, `rustls_client_connection_new()` and\n`rustls_client_connection_new_alpn()` retained a reference to the caller's\n`server_name` buffer after returning, rather than copying it. The API\ndocumentation did not require the buffer to outlive the call and as a result\nif the caller freed or reused the buffer, later TLS processing read freed\nmemory.\n\nClients that free or reuse the `server_name` buffer after the constructor\nreturns are affected. This is most likely for language bindings that pass\ntemporary strings. Callers that keep the `server_name` buffer alive for the\nlifetime of the `rustls_client_config` are not affected.\n\nVersions 0.12.0 through 0.15.6 are affected. Version 0.15.7+ changed these APIs\nto copy the input buffer.","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2026-10-26T12:00:00Z","modified":"2026-10-27T10:15:12Z","fixes":[{"ecosystem":"crates.io","package":"rustls-ffi","fixed_in":["0.15.7"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"crates.io","package":"rustls-ffi","ranges":[{"type":"SEMVER","events":[{"introduced":"0.12.0"},{"fixed":"0.15.7"}]}]}],"references":[{"url":"https://crates.io/crates/rustls-ffi","tags":["package"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0413.html","tags":["advisory"]},{"url":"https://github.com/rustls/rustls-ffi/releases/tag/v/0.15.7","tags":["web"]}],"sources":{"osv":[{"id":"RUSTSEC-2026-0413","title":"Use-after-free of caller-owned server name in client connection constructors","description":"In rustls-ffi 0.12.0 through 0.15.6, `rustls_client_connection_new()` and\n`rustls_client_connection_new_alpn()` retained a reference to the caller's\n`server_name` buffer after returning, rather than copying it. The API\ndocumentation did not require the buffer to outlive the call and as a result\nif the caller freed or reused the buffer, later TLS processing read freed\nmemory.\n\nClients that free or reuse the `server_name` buffer after the constructor\nreturns are affected. This is most likely for language bindings that pass\ntemporary strings. Callers that keep the `server_name` buffer alive for the\nlifetime of the `rustls_client_config` are not affected.\n\nVersions 0.12.0 through 0.15.6 are affected. Version 0.15.7+ changed these APIs\nto copy the input buffer.","status":"published","published":"2026-10-26T12:00:00Z","modified":"2026-10-27T10:15:12.837053276Z","updated_at":"2026-11-02T15:53:40.430679Z"}]}}