https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-06T01:18:32.507457+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-327726 EUVD-2026-327726 2026-10-06T01:18:32.558199+00:00 EUVD-2026-327726 https://cve.radiocsirt.org/vuln/fkie_cve-2026-47684 fkie_cve-2026-47684 2026-10-06T01:18:32.558237+00:00

Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.3.0, the private IP blocklist regex used in the URL download feature does not match IPv4-mapped IPv6 addresses (e.g. ::ffff:127.0.0.1), allowing SSRF protection to be bypassed on dual-stack systems. Version 2.3.0 fixes the issue.

 https://cve.radiocsirt.org/vuln/ghsa-q4x5-8cj6-52wg GHSA-q4x5-8cj6-52wg — Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP 2026-10-06T01:18:32.558271+00:00

Affected: npm: @sync-in/server

Summary: The private IP blocklist regex used in the URL download feature does not match IPv4-mapped IPv6 addresses (e.g. ::ffff:127.0.0.1), allowing SSRF protection to be bypassed on dual-stack systems.

Affected components

backend/src/applications/files/services/files-manager.service.ts – downloadFromUrl() checks regExpPrivateIP against request.socket.remoteAddress. backend/src/applications/files/utils/url-file.ts – regExpPrivateIP does not include ::ffff:<ipv4> variants.

Details: The regExpPrivateIP regex in backend/src/applications/files/utils/url-file.ts correctly blocks standard IPv4 private ranges but does not include ::ffff: prefixed variants. On dual-stack systems, Node.js can report a socket's remoteAddress in IPv4-mapped IPv6 form, meaning the check in FilesManager.downloadFromUrl() can be bypassed entirely.

PoC: [poc.pdf](https://github.com/user-attachments/files/26990874/poc.pdf)

Proof: <img width="1080" height="842" alt="1000226655" src="https://github.com/user-attachments/assets/797cea83-0a08-4a16-a91b-31c51068d473" />

Impact: An attacker can supply a crafted URL pointing to an internal address that gets reported as ::ffff:127.0.0.1 or ::ffff:10.x.x.x, causing the server to fetch internal resources that should be blocked. Any user with access to the file download feature is a potential attacker.