{"id":"GHSA-g588-cjg3-6g78","aliases":["RUSTSEC-2026-0121"],"status":"published","title":"Steamworks game clients/servers using P2P authentication vulnerable to denial of service","description":"Processing the raw `ValidateAuthTicketResponse_t` callback data panics when the `m_eAuthSessionResponse` field is `k_EAuthSessionResponseAuthTicketNetworkIdentityFailure`. This can lead to denial of service in game clients and servers using the `begin_authentication_session` API to authenticate players if a malicious game client sends an authentication ticket with a network identity that does not match that of the verifier.","severity":{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2026-05-05T12:00:00Z","modified":"2026-05-12T05:26:26Z","fixes":[{"ecosystem":"crates.io","package":"steamworks","fixed_in":["0.13.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"steamworks","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.1"}]}]},{"source":"osv","ecosystem":"crates.io","package":"steamworks","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.13.1"}]}]},{"source":"osv","ecosystem":"crates.io","package":"steamworks","ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"0.13.1"}]}]}],"references":[{"url":"https://github.com/Noxime/steamworks-rs/issues/321","tags":["web","report"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0121.html","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-g588-cjg3-6g78"},{"url":"https://github.com/Noxime/steamworks-rs","tags":["package"]},{"url":"https://crates.io/crates/steamworks","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-g588-cjg3-6g78","title":"Steamworks game clients/servers using P2P authentication vulnerable to denial of service","description":"Processing the raw `ValidateAuthTicketResponse_t` callback data panics when the `m_eAuthSessionResponse` field is `k_EAuthSessionResponseAuthTicketNetworkIdentityFailure`. This can lead to denial of service in game clients and servers using the `begin_authentication_session` API to authenticate players if a malicious game client sends an authentication ticket with a network identity that does not match that of the verifier.","status":"published","published":"2026-05-11T14:40:17Z","modified":"2026-05-11T14:40:17Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:40:05.816188Z"}],"osv":[{"id":"GHSA-g588-cjg3-6g78","title":"Steamworks game clients/servers using P2P authentication vulnerable to denial of service","description":"Processing the raw `ValidateAuthTicketResponse_t` callback data panics when the `m_eAuthSessionResponse` field is `k_EAuthSessionResponseAuthTicketNetworkIdentityFailure`. This can lead to denial of service in game clients and servers using the `begin_authentication_session` API to authenticate players if a malicious game client sends an authentication ticket with a network identity that does not match that of the verifier.","status":"published","published":"2026-05-11T14:40:17Z","modified":"2026-05-12T05:26:26.145623189Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:46:47.472172Z"},{"id":"RUSTSEC-2026-0121","title":"Denial of service in Steamworks game clients/servers using P2P authentication","description":"Processing the raw `ValidateAuthTicketResponse_t` callback data panics when the `m_eAuthSessionResponse` field is `k_EAuthSessionResponseAuthTicketNetworkIdentityFailure`. This can lead to denial of service in game clients and servers using the `begin_authentication_session` API to authenticate players if a malicious game client sends an authentication ticket with a network identity that does not match that of the verifier.","status":"published","published":"2026-05-05T12:00:00Z","modified":"2026-05-12T05:04:00Z","updated_at":"2026-11-02T15:53:40.430679Z"}]}}