Go/github.com/modelcontextprotocol/go-sdk CVE-2026-34742: high 8.1, EPSS 0.66%

DNS Rebinding Protection Disabled by Default in Model Context Protocol Go SDK for Servers Running on Localhost

Action: Upgrade github.com/modelcontextprotocol/go-sdk to 1.4.0 or later.

go get github.com/modelcontextprotocol/go-sdk@v1.4.0

Affected

Fixed versions

Sources

• osv: GHSA-xw59-hvm2-8pj6
• https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6
• https://nvd.nist.gov/vuln/detail/CVE-2026-34742
• https://github.com/modelcontextprotocol/go-sdk/pull/760
• https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d
• https://access.redhat.com/errata/RHSA-2026:21772
• https://access.redhat.com/security/cve/CVE-2026-34742
• https://bugzilla.redhat.com/show_bug.cgi?id=2454608
• https://github.com/modelcontextprotocol/go-sdk
• https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34742.json

CVE-2026-34742 · published 2026-04-01T21:09:09Z · modified 2026-07-21T15:15:52.149296919Z · JSON