{"id":"CVE-2025-66622","state":"PUBLISHED","title":"matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values","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.","publishedAt":"2025-12-09T02:07:18.831Z","updatedAt":"2025-12-09T16:02:47.455Z","severity":{"score":1.3,"label":"Low","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["matrix-org matrix-rust-sdk"],"affected":[{"vendor":"matrix-org","product":"matrix-rust-sdk","versions":[{"version":"< 0.16.0","status":"affected"}]}],"references":["https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3","https://github.com/matrix-org/matrix-rust-sdk/pull/5924","https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0","https://rustsec.org/advisories/RUSTSEC-2025-0135.html"],"weaknesses":["CWE-755"],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/66xxx/CVE-2025-66622.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-66622","state":"PUBLISHED","datePublished":"2025-12-09T02:07:18.831Z","dateUpdated":"2025-12-09T16:02:47.455Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-12-05T15:18:02.787Z"},"containers":{"cna":{"title":"matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"matrix-org","product":"matrix-rust-sdk","versions":[{"version":"< 0.16.0","status":"affected"}]}],"references":[{"url":"https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3","name":"https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/matrix-org/matrix-rust-sdk/pull/5924","name":"https://github.com/matrix-org/matrix-rust-sdk/pull/5924","tags":["x_refsource_MISC"]},{"url":"https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0","name":"https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0","tags":["x_refsource_MISC"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2025-0135.html","name":"https://rustsec.org/advisories/RUSTSEC-2025-0135.html","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":1.3,"baseSeverity":"LOW","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-755","lang":"en","description":"CWE-755: Improper Handling of Exceptional Conditions","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-12-09T02:07:18.831Z"},"source":{"advisory":"GHSA-jj6p-3m75-g2p3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-12-09T14:16:11.253556Z","id":"CVE-2025-66622","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-12-09T16:02:47.455Z"}}]}}}