CVE-2026-4810

published 2026-04-13

CVE-2026-4810: A Code Injection and Missing Authentication vulnerability in Google Agent Development Kit (ADK) versions 1.7.0 (and 2.0.0a1) through 1.28.1 (and 2.0.0a2) on…

Priority P2 76 critical 9.3 CVSS 4.0

AV N AC L AT N PR N UI N VC H VI H VA H SC H SI H SA H E P 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 Amber

EXPLOIT

A Code Injection and Missing Authentication vulnerability in Google Agent Development Kit (ADK) versions 1.7.0 (and 2.0.0a1) through 1.28.1 (and 2.0.0a2) on Python (OSS), Cloud Run, and GKE allows an unauthenticated remote attacker to execute arbitrary code on the server hosting the ADK instance.

This vulnerability was patched in versions 1.28.1 and 2.0.0a2.

Customers need to redeploy the upgraded ADK to their production environments. In addition, if they are running ADK Web locally, they also need to upgrade their local instance.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
google_cloud	agent_development_kit	>= 1.7.0 < 1.28.1	1.28.1
google_cloud	agent_development_kit	>= 2.0.0a1 < 2.0.0a2	2.0.0a2

Detection & IOCs extracted from sources · hover to see the quote

url POST /builder/save HTTP/1.1

url GET /list-apps?detailed=true HTTP/1.1

path /builder/save

path /list-apps?detailed=true

filename agent.py

other shodan-query: title:"ADK" http.component:"uvicorn"

other fofa-query: body="ADK" && header="uvicorn"

• → Detect unauthenticated POST requests to the /builder/save endpoint with multipart/form-data content type containing a Python file upload (agent.py). No authentication headers are required by the attacker.
• → Successful exploitation results in HTTP 200 response with body value 'true' from /builder/save, followed by the uploaded agent name appearing in /list-apps?detailed=true response body.
• → The exploit uploads a malicious agent.py file via multipart form-data to /builder/save. The file contains arbitrary Python code (e.g., outbound HTTP callback) alongside a valid google.adk.agents Agent definition to blend in.
• → Hunt for Google ADK instances exposed on the internet using Shodan query: title:"ADK" http.component:"uvicorn" or FOFA query: body="ADK" && header="uvicorn"
• → Outbound DNS/HTTP callbacks from the ADK server process to unexpected external hosts following a POST to /builder/save may indicate successful code injection exploitation.
• → Vulnerability affects Google ADK Python versions 1.7.0 through 1.28.1 and 2.0.0a1 through 2.0.0a2 on OSS, Cloud Run, and GKE deployments. No authentication is required to exploit. ↗

• · The Nuclei template uses randomized agent names and instructions per request (rand_text_alpha, rand_base), so static string matching on those values is not viable for detection; focus on the endpoint paths and multipart upload of .py files instead.
• · The multipart boundary is dynamically generated per request (md5 of datetime), so boundary-based signatures will not reliably detect exploitation attempts.
• · Patched versions are 1.28.1 and 2.0.0a2; customers must redeploy the upgraded ADK to production environments AND upgrade local ADK Web instances separately. ↗

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