CVE-2026-47878: DefaultExecutionContextSerializer, used by default in Spring Batch's JDBC job repository, passes Base64-decode

Routine

MEDIUM 5.6REMOTEUPGRADE

CVE-2026-47878 is a medium-severity flaw (CVSS 5.6) affecting spring batch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-08-27
Last modified	2026-09-10

Publisher (CNA): VMware · Vendor: broadcom

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-27 06:17 UTCPublished CVE record published
2026-09-10 15:28 UTCUpdated Record last modified

broadcom spring batch UPGRADE

Affected: >= 5.0.0 and < 5.2.7 · >= 6.0.0 and < 6.0.4.1

Fixed in: 5.2.7, 6.0.4.1

Safe to downgrade to: a release before 5.0.0

1. Check installed version

apt-cache policy spring-batch || rpm -q spring-batch || spring-batch --version

2. UPGRADE to 5.2.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spring-batch

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-batch

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison spring-batch sudo apt install spring-batch=<VERSION_BEFORE_5.0.0> sudo apt-mark hold spring-batch

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spring-batch sudo dnf downgrade spring-batch-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add spring-batch

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Spring Security Advisories: cve-2026-47878 - MEDIUM - Unsafe Java deserialization in DefaultExecutionContextSerializer without class allowlist 2026-08-20

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47878?

spring batch: upgrade to 5.2.7, 6.0.4.1. Exact commands for each OS are on this page.

Is CVE-2026-47878 being exploited?

CVE-2026-47878 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47878 affect?

CVE-2026-47878 affects spring batch. Severity is medium (CVSS 5.6). 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.

How urgent is CVE-2026-47878?

Priority 32/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-47875 MEDIUM 5.6 UPGRADE Applications that deserialize execution contexts with Jackson2ExecutionContextStringSerializer are vulnerable
CVE-2026-47881 MEDIUM 5.9 UPGRADE Spring Batch's FlatFileItemReader supports files where a single logical record spans multiple physical lines —

References

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