CVE-2025-11915

HTTP Desynchronisation in Vertex AI for certain third-party models

State: Published
Severity: 6.9 Medium
Published: Oct 22, 2025
Updated: Oct 23, 2025
Reserved: Oct 17, 2025

Description

Connection desynchronization between an HTTP proxy and the model backend. The fixes were rolled out for all proxies in front of impacted models by 2025-09-28. Users do not need to take any action.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L/U:Clear	GoogleCloud

Weaknesses

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Products

Product	Versions
Vertex AI: Partner Models for MaaSGoogle Cloud	before 2025-09-26Affected
Vertex AI: Open Models for MaaSGoogle Cloud	before 2025-09-28Affected
Vertex AI: Self-Deployed ModelsGoogle Cloud	before 2025-09-28Affected

References

https://cloud.google.com/vertex-ai/generative-ai/docs/security-bulletins#gcp-2025-059

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