What is CVE-2026-40975?

CVE-2026-40975 is a medium-severity vulnerability in Spring Boot, classified under Use of Insufficiently Random Values. CVSS score: 4.8/10. Published 2026-04-28.

How severe is CVE-2026-40975?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Spring Boot

CVE-2026-40975

Values produced by ${random.value} are not suitable for use as secrets. ${random.uuid} is not affected. ${random.int} and ${random.long} should never be used for secrets as they are numeric values with a predictable range. 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); random value property source / weak PRNG for secrets. Versions that are no longer supported are also affected per vendor advisory.

EPSS: 0.003 (23.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Spring Boot — versions 4.0.0, 3.5.0, 3.4.0
Vmware Spring_boot

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-40975?: CVE-2026-40975 is a medium-severity vulnerability in Spring Boot, classified under Use of Insufficiently Random Values. CVSS score: 4.8/10. Published 2026-04-28.
How severe is CVE-2026-40975?: Medium severity. CVSS v3 base score is 4.8 out of 10.