CVE-2026-47881: Denial of Service in Spring Batch FlatFileItemReader via Malformed Input File

Severity: high (CVSS 7.5 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 2026-09-01
Weakness: CWE-400

Description

Spring Batch's FlatFileItemReader supports files where a single logical record spans multiple physical lines — for example, a CSV field that contains embedded newlines wrapped in quotes. A specially crafted input file could exploit the way the reader assembles those multi-line records to consume excessive CPU time and memory, causing the batch job to stall or run out of memory. Spring Batch 6.0.0 - 6.0.4 Spring Batch 5.2.0 - 5.2.6 Spring Batch 4.3.0 - 4.3.13

Affected products

Spring Batch: from 4.3.0 before 4.3.14; from 5.2.0 before 5.2.7; from 6.0.0 before 6.0.4.1 — fixed in 4.3.14, 5.2.7, 6.0.4.1

How to fix

Upgrade to a fixed version: Spring Batch 4.3.14, 5.2.7, 6.0.4.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-47881

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