8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-31129

CVE-2025-31129: 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:

https://github.com/jooby-project/jooby/blob/v2.x/modules/jooby-pac4j/src/main/java/io/jooby/internal/pac4j/SessionStoreImpl.java#L39-L45

Version 3.x: https://github.com/jooby-project/jooby/blob/v3.6.1/modules/jooby-pac4j/src/main/java/io/jooby/internal/pac4j/SessionStoreImpl.java#L77-L84

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.

屏幕截图 2025-03-25 051325

And following below is exploiting successfully(execute calculator)

屏幕截图 2025-03-24 015128（1）

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-31129

CVE-2025-31129:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
io.jooby:jooby-pac4j	maven	< 2.17.0	2.17.0
io.jooby:jooby-pac4j	maven	>= 3.0.0.M1, < 3.7.0	3.7.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from insecure Java object serialization in session handling. The strToObject method directly deserialized Base64-encoded data using ObjectInputStream when values started with 'b64~', allowing arbitrary object deserialization. The objToStr method similarly used ObjectOutputStream for serialization. Both methods were modified in the patch to use a configurable serializer instead of native Java serialization. These functions would appear in runtime profiles when processing session data containing serialized objects, particularly during authentication flows using pac4j session storage.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Rule

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Reasoning

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