CVE-2026-4810: Google Agent Development Kit (ADK) has a Code Injection and Missing Authentication vulnerability

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
• EPSS 2.2%, percentile 82: FIRST’s model estimates a 2.2% chance of exploitation activity in the next 30 days, higher than 82% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes google-adk (PyPI) >= 2.0.0a1, < 2.0.0a2, fixed in 2.0.0a2; google-adk (PyPI) >= 1.7.0, < 1.28.1, fixed in 1.28.1. Check your lockfile, including transitive dependencies.

What it is

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.

From the GitHub advisory

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.

Weakness type: CWE-306.

Product: google-adk (PyPI) · Assigned by: GoogleCloud · Published: 2026-04-13

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 2.21% probability of exploitation activity in the next 30 days; percentile 82.

Timeline

• 2026-04-13 — CVE record last updated
• 2026-04-13 — CVE record published by GoogleCloud
• 2026-04-13 — GitHub-reviewed advisory GHSA-rg7c-g689-fr3x published (critical)

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-rg7c-g689-fr3x github.com
2. CVE.org record CVE-2026-4810 cve.org
3. NVD entry CVE-2026-4810 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com

Critical PyPI advisories · Today’s Security Digest