VulnerabilityPublished 28 Oct 2026

CVE-2026-115522: Google Agent Development Kit (ADK) for Python · Resource Exposure

Affects Google Agent Development Kit (ADK) for PythonSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium : upgrade to 2.7.0 or 1.39.1 when convenient.

Data as of 28 Oct 2026, 04:57 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 2.7.0, 1.39.1

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Agent Development Kit (ADK) for Python and google-adk to 2.7.0 or 1.39.1.

Affected software

Product	Affected	Fixed in
Agent Development Kit (ADK) for Pythongoogle-adk	Affected >=2.0.0a1 <2.7.0	Fixed in 2.7.0
Agent Development Kit (ADK) for Pythongoogle-adk	Affected >=1.19.0 <1.39.1	Fixed in 1.39.1
GitHubgoogle-adk`pkg:github/google-adk`Other threats	Affected >=1.19.0 <1.39.1 >=2.0.0a1 <2.7.0	Fixed in 1.39.1 2.7.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability is fixed in Google ADK for Python versions 1.39.1 and 2.7.0, which enforce full per-application path scoping. Users should upgrade to these versions or later to remediate the issue. No additional mitigations are indicated by the vendor advisory.

Description

CVE-2026-115522 is a vulnerability in Google Agent Development Kit (ADK) for Python that allows an application to access or modify artifacts belonging to another application when both share a FileArtifactService root directory and the same user_id. This occurs because the service omitted the application name when constructing on-disk paths, leading to improper resource isolation. The issue affects versions 1.19.0 through before 1.39.1 and 2.0.0a1 through before 2.7.0. The vulnerability was fixed by enforcing full per-application path scoping in versions 1.39.1 and 2.7.0.

Impact

An attacker with access to the same user_id and session_id context can access or modify artifacts belonging to other applications sharing the same FileArtifactService root directory. This can lead to unauthorized disclosure, modification, or deletion of data across applications, violating data isolation principles. The CVSS 4.0 score is 5.3 (medium severity), reflecting network attack vector, low complexity, no user interaction, and limited confidentiality and integrity impact.

Summary

The vulnerability CVE-2026-115522 in Google Agent Development Kit (ADK) for Python arises from improper path scoping in the FileArtifactService component. The service accepted an application name in its API but did not include it in the on-disk path construction, using a shared root path based only on user_id. This allowed callers from one application to list, read, overwrite, or delete artifacts of another application if they shared the same user_id and session_id. Version 2.6.0 partially scoped writes by app_name but retained legacy fallback paths for reads and deletes, which was fully removed in version 2.7.0 and backported to 1.39.1, thereby fixing the issue by enforcing strict per-app path isolation.

CWE-668Exposure of Resource to Wrong Sphere (opens in a new tab)
Class weaknessOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
OWASP Cheat Sheets
Authorization (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Oct 2026, 04:44 UTC

WeaknessesCWE-668

Technical details

References

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