What’s Vulnerable › Vulnerabilities

CVE-2026-58270: Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-24
• Weakness: CWE-1333

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.

Affected products

• Sync-in server: before 2.4.0

References

• https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph
• https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph

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