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CVE-2026-115522: Cross-Application Artifact Namespace Isolation in Google Agent Development Kit (ADK) for Python

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-28 · updated 2026-10-28
• Weakness: CWE-668

Description

Exposure of Resource to Wrong Sphere (CWE-668) in FileArtifactService in Google Agent Development Kit (ADK) for Python (google-adk) versions 1.19.0 before 1.39.1 and 2.0.0a1 before 2.7.0 allows a caller in one application to list, read, overwrite, or delete artifacts belonging to another application when both applications share a FileArtifactService root directory and use the same user_id (and session_id for session-scoped artifacts). FileArtifactService accepted app_name across its public API methods but omitted app_name when constructing on-disk paths (root/users/{user_id}/... instead of root/apps/{app_name}/users/{user_id}/...). Version 2.6.0 scoped writes by app_name but retained a legacy root/users/{user_id} fallback for reads and deletes; version 2.7.0 and the 1.x backport in version 1.39.1 removed the fallback and enforce full per-app path scoping.

Affected products

• Google Cloud Agent Development Kit (ADK) for Python: from 1.19.0 before 1.39.1; from 2.0.0a1 before 2.7.0 — fixed in 1.39.1, 2.7.0

How to fix

Upgrade to a fixed version: Google Cloud Agent Development Kit (ADK) for Python 1.39.1, 2.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/google/adk-python/commit/0ae2bffdd2628af6c8643bc4fd40c2f49f0c6bd4
• https://github.com/google/adk-python/commit/c27d8688ed9ea619587ad96cbfd641c34dd7340c
• https://github.com/google/adk-python/commit/f72f0db58c5c1f4e8b8d4f04b8c592c9e49cbe9e
• https://github.com/google/adk-python/issues/5618
• https://github.com/google/adk-python/pull/5619
• https://github.com/google/adk-python/releases/tag/v1.39.1
• https://github.com/google/adk-python/releases/tag/v2.7.0

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