CVE-2026-58270 json
Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`
published last mo. modified last mo. also EUVD-2026-84198 , GHSA-jx63-h26r-8cph
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
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-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.
Patch / fix
- npm @sync-in/server 2.4.0
- sync-in sync-in_server 2.4.0
- github.com/Sync-in/server@b1dcaa1 commit
- github.com/Sync-in/server#228 pull request
- github.com/Sync-in/server/releases/tag/v2.4.0 release
Is CVE-2026-58270 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @sync-in/server | <2.4.0 |
2.4.0 |
Affected products
- Sync-in server
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
References
-
github.com
/Sync-in/server/pull/228
web
-
github.com
/Sync-in/server/commit/b1dcaa1d1c1bb17ab6c31a404cc9cead7efdd979
web
-
github.com
/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-58270
advisory
-
github.com
/Sync-in/server
package
-
github.com
/Sync-in/server/releases/tag/v2.4.0
web
Sources
- CVE List CVE-2026-58270
- GitHub Advisory GHSA-jx63-h26r-8cph
- NVD CVE-2026-58270
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.