CVE-2026-47842: Applications using AesBytesEncryptor with the two-argument constructor or when passing a null IV generator and

Routine

MEDIUM 6.5UPGRADE

CVE-2026-47842 is a medium-severity flaw (CVSS 6.5) affecting spring security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Applications using AesBytesEncryptor with the two-argument constructor or when passing a null IV generator and CBC as the encryption mode encrypt data with AES/CBC using a null (all-zero) initialization vector. Spring Security 7.1.0 Spring Security 7.0.0 - 7.0.6 Spring Security 6.5.0 - 6.5.11 Spring Security 6.4.0 - 6.4.18 Spring Security 5.8.0 - 5.8.27 Spring Security 5.7.0 - 5.7.25

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-326
Published	2026-08-26
Last modified	2026-09-04

Publisher (CNA): VMware · Vendor: vmware

Last updated 2026-09-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-26 20:17 UTCPublished CVE record published
2026-09-04 19:34 UTCUpdated Record last modified

vmware spring security UPGRADE

Affected: >= 5.7.0 and < 5.7.26 · >= 5.8.0 and < 5.8.28 · >= 6.4.0 and < 6.4.19 · >= 6.5.0 and < 6.5.12 · >= 7.0.0 and < 7.0.6.1 · >= 7.1.0 and < 7.1.0.1

Fixed in: 5.7.26, 5.8.28, 6.4.19, 6.5.12, 7.0.6.1, 7.1.0.1

Safe to downgrade to: a release before 5.7.0

1. Check installed version

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

2. UPGRADE to 5.7.26 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-security

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 5.7.0 (Debian / Ubuntu)

apt-cache madison spring-security sudo apt install spring-security=<VERSION_BEFORE_5.7.0> sudo apt-mark hold spring-security

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

dnf --showduplicates list spring-security sudo dnf downgrade spring-security-<VERSION_BEFORE_5.7.0> sudo dnf versionlock add spring-security

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-2026-47842 - MEDIUM - Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Correlation 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-2026-47842?

spring security: upgrade to 5.7.26, 5.8.28, 6.4.19, 6.5.12, 7.0.6.1, 7.1.0.1. Exact commands for each OS are on this page.

Is CVE-2026-47842 being exploited?

CVE-2026-47842 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-2026-47842 affect?

CVE-2026-47842 affects spring security. Severity is medium (CVSS 6.5). Applications using AesBytesEncryptor with the two-argument constructor or when passing a null IV generator and CBC as the encryption mode encrypt data with AES/CBC using a null (all-zero) initialization vector. Spring Security 7.1.0 Spring

How urgent is CVE-2026-47842?

Priority 24/100. No elevated risk signals yet.

Software pages

VMware vulnerabilities

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References

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