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CVE

CVE-2026-11624

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks.
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CVE

CVE-2026-11624

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks.

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup. Both flags default to "", allowing users to implement strict access controls as needed without breaking existing setups. If either flag is set to "", the server will output a startup warning about potential vulnerabilities. Documentation has also been updated to highlight these security considerations.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.4
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11624.json, https://nvd.nist.gov/vuln/detail/CVE-2026-11624, https://github.com/googleapis/mcp-toolbox/issues/3113, https://github.com/googleapis/mcp-toolbox/pull/2254

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00153%
EPSS Percentile
0.04977%
Introduced Version
0
Fix Available
41b518b955af8710c5b9b1aacddcfab63ff505bd

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