{"id":"RUSTSEC-2026-0413","aliases":["GHSA-rc3f-4j82-cmrg"],"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.","severity":"unknown","score":null,"published":"2026-10-26T12:00:00.000Z","modified":"2026-10-27T10:15:12.837Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"crates.io","name":"rustls-ffi","ranges":[{"events":[{"introduced":"0.12.0"},{"fixed":"0.15.7"}],"type":"SEMVER"}],"versions":[],"fixed":["0.15.7"]}],"references":["https://crates.io/crates/rustls-ffi","https://rustsec.org/advisories/RUSTSEC-2026-0413.html","https://github.com/rustls/rustls-ffi/releases/tag/v/0.15.7"],"sources":[{"name":"OSV","id":"RUSTSEC-2026-0413","modified":"2026-10-27T10:15:12.837053276Z","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0413"}],"assessments":[]}