{"cve":"CVE-2025-66622","nvd":{"published":"2025-12-09T16:18:21.747","modified":"2026-10-07T20:10:01.970","status":"Analyzed","description":"matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This 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. This is fixed in version 0.16.0.","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":1.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-755"],"references":["https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0","https://github.com/matrix-org/matrix-rust-sdk/pull/5924","https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3","https://rustsec.org/advisories/RUSTSEC-2025-0135.html"],"products":["matrix:matrix-rust-sdk"],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-66622","score":0.00413,"percentile":0.35294,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-jj6p-3m75-g2p3","url":"https://osv.dev/vulnerability/GHSA-jj6p-3m75-g2p3","summary":" matrix-sdk-base denial of service via custom m.room.join_rules event values","modified":"2025-12-09T19:36:28.271982Z","packages":[{"ecosystem":"crates.io","name":"matrix-sdk-base","purl":"pkg:cargo/matrix-sdk-base","ranges":["<0.16.0"],"fixed":["0.16.0"]}]},{"id":"RUSTSEC-2025-0135","url":"https://osv.dev/vulnerability/RUSTSEC-2025-0135","summary":"matrix-sdk-base: Denial of service due to custom `m.room.join_rules` events","modified":"2026-10-12T18:00:07.355162307Z","packages":[{"ecosystem":"crates.io","name":"matrix-sdk-base","purl":"pkg:cargo/matrix-sdk-base","ranges":[">=0.0.0-0 <0.16.0"],"fixed":["0.16.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}