CVE-2026-35577: Apollo MCP Server is a Model Context Protocol server that exposes GraphQL operations as MCP tools

Q: How do I fix CVE-2026-35577?

apollo mcp server: upgrade to 1.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-35577 being exploited?

CVE-2026-35577 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35577 affect?

CVE-2026-35577 affects apollo mcp server. Severity is medium (CVSS 6.8). Apollo MCP Server is a Model Context Protocol server that exposes GraphQL operations as MCP tools. Prior to version 1.7.0, the Apollo MCP Server did not validate the Host header on incoming HTTP requests when using StreamableHTTP transport.

Q: How urgent is CVE-2026-35577?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.8UPGRADE

CVE-2026-35577 is a medium-severity flaw (CVSS 6.8) affecting apollo mcp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apollo MCP Server is a Model Context Protocol server that exposes GraphQL operations as MCP tools. Prior to version 1.7.0, the Apollo MCP Server did not validate the Host header on incoming HTTP requests when using StreamableHTTP transport. In configurations where an HTTP-based MCP server is run on localhost without additional authentication or network-level controls, this could potentially allow a malicious website—visited by a user running the

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: apollographql

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 20:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

apollographql apollo mcp server UPGRADE

Affected: < 1.7.0

Fixed in: 1.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy apollo-mcp-server || rpm -q apollo-mcp-server || apollo-mcp-server --version

2. UPGRADE to 1.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apollo-mcp-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apollo-mcp-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35577?

apollo mcp server: upgrade to 1.7.0. Exact commands for each OS are on this page.

Is CVE-2026-35577 being exploited?

CVE-2026-35577 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35577 affect?

CVE-2026-35577 affects apollo mcp server. Severity is medium (CVSS 6.8). Apollo MCP Server is a Model Context Protocol server that exposes GraphQL operations as MCP tools. Prior to version 1.7.0, the Apollo MCP Server did not validate the Host header on incoming HTTP requests when using StreamableHTTP transport.

How urgent is CVE-2026-35577?

Priority 26/100. No elevated risk signals yet.

References

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