{"id":"CVE-2026-58270","state":"PUBLISHED","title":"Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`","description":"Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, the sync diff endpoint compiles a user-supplied string into a `RegExp` with no complexity validation. A catastrophic-backtracking pattern (e.g. `^(a+)+b`) blocks the Node.js event loop, making the entire server unresponsive to all users until the container is restarted. Version 2.4.0 patches the issue.","publishedAt":"2026-09-21T20:28:53.535Z","updatedAt":"2026-09-22T14:06:46.587Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["Sync-in server"],"affected":[{"vendor":"Sync-in","product":"server","versions":[{"version":"< 2.4.0","status":"affected"}]}],"references":["https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/58xxx/CVE-2026-58270.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-58270","state":"PUBLISHED","datePublished":"2026-09-21T20:28:53.535Z","dateUpdated":"2026-09-22T14:06:46.587Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-29T21:54:30.332Z"},"containers":{"cna":{"title":"Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`","descriptions":[{"lang":"en","value":"Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, the sync diff endpoint compiles a user-supplied string into a `RegExp` with no complexity validation. A catastrophic-backtracking pattern (e.g. `^(a+)+b`) blocks the Node.js event loop, making the entire server unresponsive to all users until the container is restarted. Version 2.4.0 patches the issue."}],"affected":[{"vendor":"Sync-in","product":"server","versions":[{"version":"< 2.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","name":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-21T20:28:53.535Z"},"source":{"advisory":"GHSA-jx63-h26r-8cph","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T14:06:26.710916Z","id":"CVE-2026-58270","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-22T14:06:46.587Z"}}]}}}