auth-fetch-mcp SSRF Protection Bypass via IPv6 Loopback
auth-fetch-mcp version 3.0.1 contains a Server-Side Request Forgery vulnerability where IPv4-mapped IPv6 loopback addresses bypass SSRF protection, allowing access to blocked loopback services. The issue was patched in version 3.0.1.
Disclosed 13 August 2026 · Record updated 1 October 2026
Impact
SSRF protection can be bypassed to reach loopback services that should be blocked under default configuration
Our coverage
No articles linked to this incident yet.
Sources
- nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-49857
