Vulnerability in Spring Security
CVE-2026-47842
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
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Spring Security — versions 7.1.0
References
Frequently asked questions
- What is CVE-2026-47842?
- CVE-2026-47842 is a medium-severity vulnerability in Spring Security, classified under CWE-329 GENERATION OF PREDICTABLE IV WITH CBC MODE. CVSS score: 6.5/10. Published 2026-08-26.
- How severe is CVE-2026-47842?
- Medium severity. CVSS v3 base score is 6.5 out of 10.