CVE-2026-40975Network attack vector

Secret prediction via noncryptographic random generation

Published Apr 27, 2026 · Updated Apr 27, 2026

Weak random generation in affected Spring Boot releases allows remote attackers to predict secrets derived from ${random.value}. RandomValuePropertySource instantiates java.util.Random rather than a cryptographically secure generator, making its output predictable from recovered PRNG state. Exploitation requires an application to use ${random.value} for a security-sensitive value and expose related output; ${random.uuid} is unaffected.

CVSS severity4.8
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak random generation in affected Spring Boot releases allows remote attackers to predict secrets derived from ${random.value}. RandomValuePropertySource instantiates java.util.Random rather than a cryptographically secure generator, making its output predictable from recovered PRNG state. Exploitation requires an application to use ${random.value} for a security-sensitive value and expose related output; ${random.uuid} is unaffected.

The record

CVE
CVE-2026-40975
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
Spring
Product
Spring Boot
Classifications
CWE-338, CWE-330
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.7.0 <2.7.33
  2. Affected versionversion=3.3.0 <3.3.19
  3. Affected versionversion=3.4.0 <3.4.16
  4. Affected versionversion=3.5.0 <3.5.14
  5. Affected versionversion=4.0.0 <4.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Bootversion=2.7.0 <2.7.33; version=3.3.0 <3.3.19; version=3.4.0 <3.4.16; version=3.5.0 <3.5.14; version=4.0.0 <4.0.6

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.2Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
4.8VMwareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
CWE-330Use of Insufficiently Random Values

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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