CVE-2026-40972
Description
A flaw was found in Spring Boot. An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about a remote secret. In extreme circumstances, this could allow the attacker to determine the secret and upload changed classes, leading to remote code execution in the remote application.
Mitigation
To mitigate this issue, disable the Spring Boot DevTools remote functionality in production environments. This feature is primarily intended for development and should not be enabled in publicly accessible deployments.
To disable remote DevTools, ensure the `spring.devtools.remote.secret` property is not configured, or explicitly set `spring.devtools.remote.enabled=false` in your application's `application.properties` or `application.yml` file.
Example for `application.properties`:
`spring.devtools.remote.enabled=false`
Disabling this feature may impact development workflows that rely on remote DevTools capabilities. A restart of the application is required for the changes to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Adjacent Network | N/A | Adjacent Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality,Access Control
Technical Impact: Read Application Data; Bypass Protection Mechanism
Frequently Asked Questions
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