GHSA-q4x5-8cj6-52wg
Suggest an improvement- Source
- https://github.com/advisories/GHSA-q4x5-8cj6-52wg
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q4x5-8cj6-52wg/GHSA-q4x5-8cj6-52wg.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-q4x5-8cj6-52wg
- Aliases
-
- CVE-2026-47684
- Published
- 2026-06-05T16:34:59Z
- Modified
- 2026-06-05T16:45:18.933180123Z
- Severity
-
- 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
- Summary
- Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIP
- Details
-
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
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.
- Database specific
{ "nvd_published_at": null, "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2026-06-05T16:34:59Z", "cwe_ids": [ "CWE-918" ] }- References
Affected packages
npm / @sync-in/server
Package
- Name
- @sync-in/server
- View open source insights on deps.dev
- Purl
- pkg:npm/%40sync-in%2Fserver