Vulnerability · Published Apr 27, 2026 · Assigned by vmware
CVE-2026-40972
High 7.5
In plain English
A high-severity security flaw in Spring Boot from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.springframework.boot:spring-boot-devtools | 4.0.6 | GHSA-56v8-86gj-66jp |
| Maven | org.springframework.boot:spring-boot-devtools | 3.5.14 | GHSA-56v8-86gj-66jp |
| Maven | org.springframework.boot:spring-boot-devtools | no fix listed | GHSA-56v8-86gj-66jp |
| Maven | org.springframework.boot:spring-boot-devtools | no fix listed | GHSA-56v8-86gj-66jp |
| Maven | org.springframework.boot:spring-boot-devtools | no fix listed | GHSA-56v8-86gj-66jp |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Spring | Spring Boot | 4.0.0 – before 4.0.63.5.0 – before 3.5.143.4.0 – before 3.4.163.3.0 – before 3.3.192.7.0 – before 2.7.33 |
Weakness: CWE-208 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H