High severity · published Apr 27, 2026
CVE-2026-40972
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
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SB
Spring Boot · Spring
4.0.0 before 4.0.6; 3.5.0 before 3.5.14; 3.4.0 before 3.4.16; 3.3.0 before 3.3.19; 2.7.0 before 2.7.33 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40972
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40972
Vendor Advisory
https://spring.io/security/cve-2026-40972
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