CVE-2026-40966

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.9
EG Score
5.9(medium)
EPSS
14.1%
KEV
Not listed

Published

April 28, 2026

Last Modified

April 29, 2026

Advisory Details (1)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

CVE-2026-40966: VectorStoreChatMemoryAdvisor conversation scoping can lead to cross-tenant memory exfiltration

https://spring.io/security/cve-2026-40966

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.springframework.ai:spring-ai-advisors-vector-store1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.41.1.5—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
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  3. 2026-06-23 21:33 UTCEPSS rescore
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  6. 2026-06-21 14:56 UTCEPSS rescore
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  8. 2026-06-21 01:59 UTCEPSS rescore
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  14. 2026-06-15 17:49 UTCEPSS rescore
  15. 2026-06-14 09:51 UTCEG score recompute
  16. 2026-06-13 23:00 UTCEPSS rescore
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  19. 2026-06-12 06:55 UTCEG score recompute
  20. 2026-06-11 14:00 UTCEPSS rescore
  21. 2026-06-11 05:59 UTCEG score recompute
  22. 2026-06-10 22:18 UTCEPSS rescore
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  25. 2026-06-10 01:00 UTCEG score recompute
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  27. 2026-06-08 14:17 UTCEPSS rescore
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  29. 2026-06-07 17:25 UTCEG score recompute
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  36. 2026-06-05 15:32 UTCEG score recompute
  37. 2026-06-05 06:10 UTCEPSS rescore
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  40. 2026-06-04 13:12 UTCEPSS rescore
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  45. 2026-06-01 13:52 UTCEPSS rescore
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  48. 2026-06-01 11:19 UTCEG score recompute
  49. 2026-05-31 22:30 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-40966?
CVE-2026-40966 is a medium vulnerability published on April 28, 2026. 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…
When was CVE-2026-40966 disclosed?
CVE-2026-40966 was first published in the National Vulnerability Database on April 28, 2026, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40966 actively exploited?
CVE-2026-40966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40966?
CVE-2026-40966 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-40966?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40966, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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