Review reviewHigh

CVE-2026-40972

Spring Spring Boot, spring boot

An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application. Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); DevTools remote secret comparison. Versions that are no longer supported are also affected per vendor advisory.

CVSS: 7.5
EPSS: 0.26%
CISA KEV: Not listed
Published: 2026.04.28

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.26%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Spring Spring Boot, spring boot
Affected versions: >= 4.0.0 < 4.0.6, >= 3.5.0 < 3.5.14, >= 3.4.0 < 3.4.16, >= 3.3.0 < 3.3.19, >= 2.7.0 < 2.7.33, < 2.7.33
Fixed versions: 2.7.33, 3.3.19, 3.4.16, 3.5.14, 4.0.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Spring Spring Boot, spring boot and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-208