CVE-2026-59308Network attack vector

Cross-context response disclosure via truncated prompt hash

Published Aug 21, 2026 · Updated Aug 21, 2026

Cache isolation failure in Spring AI 2.0.0 allows remote authenticated users to receive responses cached for unrelated system prompts. The Semantic Cache context-key path truncates a SHA-256 digest of the system prompt, allowing distinct prompts to share a cache partition. Exploitation requires Semantic Cache, separate trust contexts represented by different system prompts, and attacker-controlled queries; consequences are limited to returned cached content and response integrity.

CVSS severity4.2
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cache isolation failure in Spring AI 2.0.0 allows remote authenticated users to receive responses cached for unrelated system prompts. The Semantic Cache context-key path truncates a SHA-256 digest of the system prompt, allowing distinct prompts to share a cache partition. Exploitation requires Semantic Cache, separate trust contexts represented by different system prompts, and attacker-controlled queries; consequences are limited to returned cached content and response integrity.

The record

CVE
CVE-2026-59308
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
Spring
Product
Spring AI
Classifications
CWE-668
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Spring · Spring AIversion=2.0.0

Published CVSS scores

4.2VMwareCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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