CVE-2026-47878: Unsafe Java deserialization in DefaultExecutionContextSerializer without class allowlist

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-27 · updated 2026-09-10
Weakness: CWE-502

Description

DefaultExecutionContextSerializer, used by default in Spring Batch's JDBC job repository, passes Base64-decoded bytes directly to ObjectInputStream.readObject() without an ObjectInputFilter that restricts types to a trusted class allowlist. Spring Batch 6.0.0 - 6.0.4 Spring Batch 5.2.6 and earlier

Affected products

Spring Batch: from 5.0.0 before 5.2.7; from 6.0.0 before 6.0.4.1 — fixed in 5.2.7, 6.0.4.1

How to fix

Upgrade to a fixed version: Spring Batch 5.2.7, 6.0.4.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-47878

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