CVE-2026-47842

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

State: Published
Severity: 6.5 Medium
Published: Aug 26, 2026
Updated: Aug 26, 2026
Reserved: May 20, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	vmware

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
Spring SecuritySpring	7.1.0Affected 7.0.0 through 7.0.6Affected 6.5.0 through 6.5.11Affected 6.4.0 through 6.4.18Affected 5.8.0 through 5.8.27Affected 5.7.0 through 5.7.25Affected

References

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

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