auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

Date Jul 1, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product npm · auth-fetch-mcp

CVE CVE-2026-49857

High-risk advisory CVE-2026-49857

Summary

auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

Why it matters

GitHub has published a reviewed security advisory for auth-fetch-mcp. Prioritize it with other application dependency updates.

Operator check

Check whether auth-fetch-mcp is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-pvrj-8cg3-j5f8 NVD — CVE-2026-49857 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

Get watched-vendor alerts Subscribe free Back to feed