{"id":"CVE-2026-58270","sourceIdentifier":"security-advisories@github.com","published":"2026-09-21T21:17:06.060","lastModified":"2026-09-24T21:25:27.050","vulnStatus":"Deferred","cveTags":[],"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"Sync-in","product":"server","versions":[{"version":"< 2.4.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-22T14:06:26.710916Z","id":"CVE-2026-58270","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-1333"}]}],"references":[{"url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","source":"security-advisories@github.com"},{"url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}