Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) Affecting org.springframework.boot:spring-boot package, versions [,3.5.14)[4.0.0-M1,4.0.6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Apr 2026
- disclosed23 Apr 2026
- creditUnknown
Introduced: 23 Apr 2026
CVE-2026-40975 (opens in a new tab)How to fix?
Upgrade org.springframework.boot:spring-boot to version 3.5.14, 4.0.6 or higher.
Overview
Affected versions of this package are vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) for the property source for ${random.value} (as well as ${random.int} and ${random.long}). Standard PRNGs (like java.util.Random) use deterministic mathematical algorithms starting from a seed value. Because the state space is relatively small and lacks ongoing entropy (true randomness), an attacker who observes a sequence of generated values can mathematically reverse-engineer the seed. Once the seed is known, the attacker can predict all past and future values generated by that PRNG. If these values are used to generate security-sensitive assets like API keys, session tokens, or passwords, the system becomes compromised.