CVE-2026-40966: Spring Framework Spring AI's VectorStoreChatMemoryAdvisor Conversation Scoping Vulnerability

MODERATE
Advisory Identifier: GHSA-v6x6-pjxw-3pv2
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CVSS 5.9
CWE-284
Published
Advisory Summary

CVE-2026-40966 is a MODERATE (CVSS 5.9) spring ai's vectorstorechatmemoryadvisor conversation scoping vulnerability (CWE-284: Improper Access Control) affecting Spring Framework libraries in the Maven ecosystem. The issue involves spring ai's vectorstorechatmemoryadvisor conversation scoping can lead to cross-tenant memory exfiltration. Remediation is available by upgrading affected packages to version 1.0.6, 1.1.5.

CVE-2026-40966 at a Glance

CVE Identifier CVE-2026-40966
GHSA Identifier GHSA-v6x6-pjxw-3pv2
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-284: Improper Access Control
Affected Product Spring Framework
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-40966

To remediate this vulnerability, upgrade all affected Spring Framework dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.springframework.ai:spring-ai-advisors-vector-store fixed: 1.0.6 
<dependency>
    <groupId>org.springframework.ai</groupId>
    <artifactId>spring-ai-advisors-vector-store</artifactId>
    <version>1.0.6</version>
</dependency>
org.springframework.ai:spring-ai-advisors-vector-store fixed: 1.1.5 
<dependency>
    <groupId>org.springframework.ai</groupId>
    <artifactId>spring-ai-advisors-vector-store</artifactId>
    <version>1.1.5</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.springframework.ai

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-40966, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.springframework.ai

Analyze the terminal output to locate any version of Spring Framework in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.6), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.springframework.ai command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Spring Framework, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In Spring AI, an attacker can bypass conversation isolation and exfiltrate sensitive memory from other users’ chat histories, including secrets and credentials, by injecting filter logic through conversationId. Only applications that use VectorStoreChatMemoryAdvisor and pass user-supplied input as a conversationId are affected.

CVE-2026-40966 Affected Spring Framework Versions

2 component(s)
Fixed Versions:
1.0.61.1.5
Product / Package Ecosystem Affected Versions Fixed Version
org.springframework.ai:spring-ai-advisors-vector-store
maven/org.springframework.ai/spring-ai-advisors-vector-store
Maven
≥ 1.0.0
< 1.0.6
1.0.6
org.springframework.ai:spring-ai-advisors-vector-store
maven/org.springframework.ai/spring-ai-advisors-vector-store
Maven
≥ 1.1.0
< 1.1.5
1.1.5

References

NVD — CVE-2026-40966 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40966
Spring Framework Source Repository REPOSITORY
https://github.com/spring-projects/spring-ai
jinyeong.seol.pro/blogs/cve-2026-4096... WEB
https://jinyeong.seol.pro/blogs/cve-2026-40966/en
NVD — CVE-2026-40966 NVD
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?version=3.1&vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Spring Framework Security Information SECURITY
https://spring.io/security/cve-2026-40966

Frequently Asked Questions

What is CVE-2026-40966?
CVE-2026-40966 is a security vulnerability in Spring Framework involving Spring AI's VectorStoreChatMemoryAdvisor conversation scoping can lead to cross-tenant memory exfiltration under CWE-284: Improper Access Control.
Which Spring Framework versions are affected?
Affected versions include releases prior to 1.0.6, 1.1.5 across affected packages: org.springframework.ai:spring-ai-advisors-vector-store.
What version fixes CVE-2026-40966?
Upgrading to 1.0.6, 1.1.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is spring-ai-advisors-vector-store affected?
Yes, org.springframework.ai:spring-ai-advisors-vector-store is affected in releases prior to 1.0.6, 1.1.5. Upgrade your dependency to 1.0.6, 1.1.5 or later.
What is the CVSS score of CVE-2026-40966?
CVE-2026-40966 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-40966?
CVE-2026-40966 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Maven dependencies for CVE-2026-40966?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.springframework.ai'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-v6x6-pjxw-3pv2",
  "modified" : "2026-07-17T20:49:35Z",
  "published" : "2026-04-28T09:34:13Z",
  "aliases" : [ "CVE-2026-40966" ],
  "summary" : "Spring AI's VectorStoreChatMemoryAdvisor conversation scoping can lead to cross-tenant memory exfiltration",
  "details" : "In Spring AI, an attacker can bypass conversation isolation and exfiltrate sensitive memory from other users’ chat histories, including secrets and credentials, by injecting filter logic through conversationId. Only applications that use VectorStoreChatMemoryAdvisor and pass user-supplied input as a conversationId are affected.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.ai:spring-ai-advisors-vector-store"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.0.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework.ai:spring-ai-advisors-vector-store"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.1.0"
      }, {
        "fixed" : "1.1.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40966"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/spring-projects/spring-ai"
  }, {
    "type" : "WEB",
    "url" : "https://jinyeong.seol.pro/blogs/cve-2026-40966/en"
  }, {
    "type" : "WEB",
    "url" : "https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?version=3.1&vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "WEB",
    "url" : "https://spring.io/security/cve-2026-40966"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T19:54:29Z",
    "nvd_published_at" : "2026-04-28T08:16:01Z"
  }
}