jooby-pac4j: deserialization of untrusted data
Impact
Versions after 2.x and before 3.x of io.jooby:jooby-pac4j can cause deserialization of untrusted data
Patches
- 2.17.0 (2.x)
- 3.7.0 (3.x)
Workarounds
- Not using io.jooby:jooby-pac4j until it gets patches.
- Check what values you put/save on session
References
Version 2.x:
Cause
In module pac4j io.jooby.internal.pac4j.SessionStoreImpl#get , it is used to handle sessions , and trying to get key value. In strToObject function ,it's trying to deserialize value when value starts with "b64~" , which might cause deserialization of untrusted data.
modules/jooby-pac4j/src/main/java/io/jooby/internal/pac4j/SessionStoreImpl.java
Here's a small demo using SessionStoreImpl#get to handle sessions ,and user can pass parameters.
And following below is exploiting successfully(execute calculator)
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | io.jooby:jooby-pac4j | < 2.17.0, >= 3.0.0.M1, < 3.7.0 | 2.17.0, 3.7.0 |
References
- https://github.com/jooby-project/jooby/security/advisories/GHSA-7c5v-895v-w4q5
- https://nvd.nist.gov/vuln/detail/CVE-2025-31129
- https://github.com/jooby-project/jooby/commit/3e13562cf36d7407813eae464e0f4b598de15692
- https://github.com/jooby-project/jooby
- https://github.com/jooby-project/jooby/blob/v2.x/modules/jooby-pac4j/src/main/java/io/jooby/internal/pac4j/SessionStoreImpl.java#L39-L45
- https://github.com/jooby-project/jooby/blob/v3.6.1/modules/jooby-pac4j/src/main/java/io/jooby/internal/pac4j/SessionStoreImpl.java#L77-L84
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- Java / Kotlin (Maven)
- Package
io.jooby:jooby-pac4j- Disclosed
- 01.04.2025
- Updated
- 11.10.2026 12:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7c5v-895v-w4q5 - CC BY 4.0
Vulnerability history: io.jooby:jooby-pac4j
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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