CVE-2026-45609: mcp-security provides Security and Authorization support for Model Context Protocol in Spring AI

Routine

HIGH 7.2REMOTEUPGRADE

CVE-2026-45609 is a high-severity flaw (CVSS 7.2) affecting mcp security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mcp-security provides Security and Authorization support for Model Context Protocol in Spring AI. Prior to 0.1.9, the mcp-security framework fails to implement the mandatory SSRF mitigations outlined in the Model Context Protocol (MCP) security specifications. Specifically, it processes untrusted URLs for OAuth-related discovery and metadata without verifying if the targets are malicious or internal to the network. This only affects installations

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-29
Last modified	2026-07-21

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

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-29 15:16 UTCPublished CVE record published
2026-07-21 12:10 UTCUpdated Record last modified

springaicommunity mcp security UPGRADE

Affected: >= 0.1.0 and < 0.1.9

Fixed in: 0.1.9

Safe to downgrade to: a release before 0.1.0

1. Check installed version

apt-cache policy mcp-security || rpm -q mcp-security || mcp-security --version

2. UPGRADE to 0.1.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mcp-security

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mcp-security

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.1.0 (Debian / Ubuntu)

apt-cache madison mcp-security sudo apt install mcp-security=<VERSION_BEFORE_0.1.0> sudo apt-mark hold mcp-security

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mcp-security sudo dnf downgrade mcp-security-<VERSION_BEFORE_0.1.0> sudo dnf versionlock add mcp-security

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-45609?

mcp security: upgrade to 0.1.9. Exact commands for each OS are on this page.

Is CVE-2026-45609 being exploited?

CVE-2026-45609 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-2026-45609 affect?

CVE-2026-45609 affects mcp security. Severity is high (CVSS 7.2). mcp-security provides Security and Authorization support for Model Context Protocol in Spring AI. Prior to 0.1.9, the mcp-security framework fails to implement the mandatory SSRF mitigations outlined in the Model Context Protocol (MCP) secu

How urgent is CVE-2026-45609?

Priority 33/100. High severity; Remotely exploitable, no login, no user action

References

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