Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Ratpack
Ratpack versions before 1.6.1 generate a session ID using a cryptographically weak PRNG in the JDK's ThreadLocalRandom. This means that if an attacker can determine a small window for the server start time and obtain a session ID value, they can theoretically determine the sequence of session IDs.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | io.ratpack:ratpack-groovy | < 1.6.1 | 1.6.1 |
| Java / Kotlin (Maven) | io.ratpack:ratpack-java | < 1.6.1 | 1.6.1 |
| Java / Kotlin (Maven) | io.ratpack:ratpack-session | < 1.6.1 | 1.6.1 |
References
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-338- Platform
- Java / Kotlin (Maven)
- Package
io.ratpack:ratpack-groovy, io.ratpack:ratpack-java, io.ratpack:ratpack-session- Disclosed
- 14.05.2019
- Updated
- 11.10.2026 11:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-54mg-vgrp-mwx9 - CC BY 4.0
Vulnerability history: io.ratpack:ratpack-groovy
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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