Medium severity · published Aug 26, 2026
CVE-2026-47842
Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Correlation
6.5
CVSS
0.2%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Spring Security · Spring
7.1.0; 7.0.0 through 7.0.6; 6.5.0 through 6.5.11; 6.4.0 through 6.4.18; 5.8.0 through 5.8.27; 5.7.0 through 5.7.25 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47842
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47842
Vendor Advisory
https://spring.io/security/cve-2026-47842
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