CVE-2026-47842

Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Correlation

MEDIUM

6.5

CVSS Score

Published: August 26, 2026 at 07:22 PM UTC

Updated: September 4, 2026 at 07:46 PM UTC

2 products affected across 2 vendorsSpring SecuritySpring Security

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Security · VMware

95%

5.7.0 ≤ v < 5.7.265.8.0 ≤ v < 5.8.286.4.0 ≤ v < 6.4.196.5.0 ≤ v < 6.5.127.0.0 ≤ v < 7.0.6.17.1.0 ≤ v < 7.1.0.1

Affected range stops below 5.7.26, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.4.19, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.5.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0.6.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.0.1, so it looks safe — our inference, not a vendor statement

Spring Security · Spring

60%

5.7.0 ≤ v ≤ 5.7.255.8.0 ≤ v ≤ 5.8.276.4.0 ≤ v ≤ 6.4.186.5.0 ≤ v ≤ 6.5.117.0.0 ≤ v ≤ 7.0.65.7.0 5.8.0 6.4.0 6.5.0 7.0.0 7.1.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://spring.io/security/cve-2026-47842

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-47842

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMvmware

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-326

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