CVE-2026-40966: In Spring AI, an attacker can bypass conversation isolation and exfiltrate sensitive memory from other users’

Routine

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-40966 is a medium-severity flaw (CVSS 5.9) affecting spring ai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-04-28
Last modified	2026-10-26

Publisher (CNA): VMware · Vendor: vmware

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-28 08:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

vmware spring ai UPGRADE

Affected: >= 1.0.0 and < 1.0.6 · >= 1.1.0 and < 1.1.5

Fixed in: 1.0.6, 1.1.5

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy spring-ai || rpm -q spring-ai || spring-ai --version

2. UPGRADE to 1.0.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spring-ai

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-ai

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison spring-ai sudo apt install spring-ai=<VERSION_BEFORE_1.0.0> sudo apt-mark hold spring-ai

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spring-ai sudo dnf downgrade spring-ai-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add spring-ai

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40966?

spring ai: upgrade to 1.0.6, 1.1.5. Exact commands for each OS are on this page.

Is CVE-2026-40966 being exploited?

CVE-2026-40966 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40966 affect?

CVE-2026-40966 affects spring ai. Severity is medium (CVSS 5.9). 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 Ve

How urgent is CVE-2026-40966?

Priority 29/100. Remotely exploitable, no login, no user action

Software pages

VMware vulnerabilities

Related CVEs

CVE-2026-40967 HIGH 8.6 UPGRADE In Spring AI, various FilterExpressionConverter implementations accept a filter expression object and translat
CVE-2026-40978 HIGH 8.8 UPGRADE SQL injection vulnerability in Spring AI's `CosmosDBVectorStore` allows attackers to execute arbitrary SQL que
CVE-2026-22743 HIGH 7.5 UPGRADE Spring AI's spring-ai-neo4j-store contains a Cypher injection vulnerability in Neo4jVectorFilterExpressionConv
CVE-2026-22738 CRITICAL 9.8 UPGRADE In Spring AI, a SpEL injection vulnerability exists in SimpleVectorStore when a user-supplied value is used as
CVE-2026-22742 HIGH 8.6 UPGRADE Spring AI's spring-ai-bedrock-converse contains a Server-Side Request Forgery (SSRF) vulnerability in BedrockP

References

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