# CVE-2026-4810 — Google Cloud Agent Development Kit (ADK)

> As of 2026-08-05, CVE-2026-4810 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Google Cloud Agent Development Kit (ADK), CVSS v4.0 9.3, EPSS 2.2% (82.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-4810, most recently “Agent-to-Agent Privilege Boundary Failures in Google ADK for Python (adk-python) CI/CD Workflows via Cross-Agent Prompt Injection”.

**Last updated:** 2026-08-05

## What is 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 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.

The record classifies CVE-2026-4810 under weakness class [CWE-306](https://intel.threadlinqs.com/cwe/CWE-306). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 214 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 9.3 — Critical (derived from score) (`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/U:Amber`)
- **EPSS (FIRST):** 2.2% probability of exploitation in the next 30 days, higher than 82.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-04-13

## Is CVE-2026-4810 being exploited?

A ProjectDiscovery Nuclei detection template exists (`http/cves/2026/CVE-2026-4810.yaml`). It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Google Cloud**: Agent Development Kit (ADK)

## How to fix CVE-2026-4810

No vendor patch reference has been recorded for CVE-2026-4810 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-4810

1 tracked threat in the Threadlinqs corpus references CVE-2026-4810, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Agent-to-Agent Privilege Boundary Failures in Google ADK for Python (adk-python) CI/CD Workflows via Cross-Agent Prompt Injection](https://intel.threadlinqs.com/threat/TL-2026-1897) — CRITICAL · 2026-08-05

## Sources

Enriched from CVE.org, FIRST EPSS, ProjectDiscovery Nuclei.

**Other references**

- [github.com](https://github.com/google/adk-python/blob/main/CHANGELOG.md#1274-2026-03-26)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-4810
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