CVE-2025-56404: An issue was discovered in MariaDB MCP 0.1.0 allowing attackers to gain sensitive information via the SSE serv

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-56404 is a high-severity flaw (CVSS 7.5) affecting model context protocol. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in MariaDB MCP 0.1.0 allowing attackers to gain sensitive information via the SSE service as the SSE service lacks user validation.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-20
Published	2025-09-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mariadb

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-10 14:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

mariadb model context protocol DOWNGRADE

Affected: 0.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1.0

1. Check installed version

apt-cache policy model-context-protocol || rpm -q model-context-protocol || model-context-protocol --version

2. No fixed release: DOWNGRADE to a release before 0.1.0 (Debian / Ubuntu)

apt-cache madison model-context-protocol sudo apt install model-context-protocol=<VERSION_BEFORE_0.1.0> sudo apt-mark hold model-context-protocol

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list model-context-protocol sudo dnf downgrade model-context-protocol-<VERSION_BEFORE_0.1.0> sudo dnf versionlock add model-context-protocol

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-2025-56404?

model context protocol: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-56404 being exploited?

CVE-2025-56404 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-2025-56404 affect?

CVE-2025-56404 affects model context protocol. Severity is high (CVSS 7.5). An issue was discovered in MariaDB MCP 0.1.0 allowing attackers to gain sensitive information via the SSE service as the SSE service lacks user validation.

How urgent is CVE-2025-56404?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

MariaDB vulnerabilities

References

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