{"id":"CVE-2026-58270","title":"Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing","summary":"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…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1333"],"vendor":"Sync-in","product":"server","affected":["server < 2.4.0"],"patched":["@sync-in/server 2.4.0"],"published":"2026-09-21","updated":"2026-09-22","sourceUpdated":"2026-09-22T15:17:10.410","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-58270","references":[{"url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","label":"security-advisories@github.com"},{"url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58270"},{"url":"https://github.com/Sync-in/server/pull/228"},{"url":"https://github.com/Sync-in/server/commit/b1dcaa1d1c1bb17ab6c31a404cc9cead7efdd979"},{"url":"https://github.com/Sync-in/server/releases/tag/v2.4.0"},{"url":"https://github.com/advisories/GHSA-jx63-h26r-8cph"}],"tags":["nvd","cve.org","ghsa","npm","exploit-available"],"epss":0.00289,"epssPercentile":0.21755,"aliases":["GHSA-jx63-h26r-8cph"],"ecosystem":"npm","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T14:06:26.710916Z"},"ingestedAt":"2026-09-21T20:52:58.298Z","slug":"CVE-2026-58270","body":"## Overview\n\nSync-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-58270)\n\nAffected packages:\n\n- `@sync-in/server <= 2.3.0`\n\nPatched in:\n\n- `@sync-in/server 2.4.0`\n\nSource: https://github.com/advisories/GHSA-jx63-h26r-8cph","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":209078,"id":"CVE-2026-58270","ts":1790089535889,"field":"exploit_available","old":"false","new":"true"}]}