{"id":"GHSA-jj6p-3m75-g2p3","revision":"cff74faf3f6247f1bcb648282c65ea23","records":[{"revision":"cff74faf3f6247f1bcb648282c65ea23","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-jj6p-3m75-g2p3","aliases":["CVE-2025-66622","RUSTSEC-2025-0135"],"title":" matrix-sdk-base denial of service via custom m.room.join_rules event values","description":"The matrix-sdk-base crate is unable to handle responses that include custom m.room.join_rules values due to a serialization bug.\n\nThis can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms.\n\n### Patches\nThe issue is fixed in matrix-sdk-base 0.16.0.\n\n### Workarounds\n\nUsers can leave affected rooms on another client to mitigate the issue.\n\n### References\n\nThe issue was fixed in https://github.com/matrix-org/matrix-rust-sdk/pull/5924.","state":0,"publishedAt":"2025-12-08T22:07:47+00:00","modifiedAt":"2025-12-09T19:36:28.271982+00:00","affected":[{"ecosystem":"crates.io","name":"matrix-sdk-base","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.16.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3","https://nvd.nist.gov/vuln/detail/CVE-2025-66622","https://github.com/matrix-org/matrix-rust-sdk/pull/5924","https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0","https://github.com/matrix-org/matrix-rust-sdk","https://rustsec.org/advisories/RUSTSEC-2025-0135.html"],"sourceUrl":"https://github.com/advisories/GHSA-jj6p-3m75-g2p3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-jj6p-3m75-g2p3","identifiers":["GHSA-jj6p-3m75-g2p3","CVE-2025-66622","RUSTSEC-2025-0135"]},"retained":false,"historicalAffected":[]}],"coverage":[]}