CVE-2026-40979

Local model disclosure and tampering via predictable cache

Published Apr 28, 2026 · Updated Apr 28, 2026

Insecure temporary files in Spring AI 1.0.0 through 1.0.5 and 1.1.0 through 1.1.4 allow local users to read or replace cached ONNX models. TransformersEmbeddingModel caching defaults to a predictable directory beneath the shared, world-writable system temporary path rather than a newly created user-owned directory. Only shared-host applications using TransformersEmbeddingModel with caching enabled at the default location are exposed, allowing low-privileged users to disclose or tamper with model artifacts.

CVSS severity6.1
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure temporary files in Spring AI 1.0.0 through 1.0.5 and 1.1.0 through 1.1.4 allow local users to read or replace cached ONNX models. TransformersEmbeddingModel caching defaults to a predictable directory beneath the shared, world-writable system temporary path rather than a newly created user-owned directory. Only shared-host applications using TransformersEmbeddingModel with caching enabled at the default location are exposed, allowing low-privileged users to disclose or tamper with model artifacts.

The record

CVE
CVE-2026-40979
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
Spring
Product
Spring AI
Classifications
CWE-377
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=1.0.0 <1.0.6
  2. Affected versionversion=1.1.0 <1.1.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Spring · Spring AIversion=1.0.0 <1.0.6; version=1.1.0 <1.1.5

Published CVSS scores

6.1VMwareCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-377Insecure Temporary File

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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