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CVE-2026-40972

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-27 · updated 2026-07-24
• Weakness: CWE-208

Description

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.

Affected products

• Spring Boot: before 2.7.33; from 3.3.0 before 3.3.19; from 3.4.0 before 3.4.16; from 3.5.0 before 3.5.14; from 4.0.0 before 4.0.6 — fixed in 2.7.33, 3.3.19, 3.4.16, 3.5.14, 4.0.6
• Spring Boot: from 4.0.0 before 4.0.6; from 3.5.0 before 3.5.14; from 3.4.0 before 3.4.16; from 3.3.0 before 3.3.19; from 2.7.0 before 2.7.33 — fixed in 4.0.6, 3.5.14, 3.4.16, 3.3.19, 2.7.33

How to fix

Upgrade to a fixed version: Spring Boot 2.7.33, 3.3.19, 3.4.16, 3.5.14; Spring Boot 4.0.6, 3.5.14, 3.4.16, 3.3.19. Check the vendor advisory for mitigations.

References

• https://spring.io/security/cve-2026-40972

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