CVE-2026-47842 Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Correlation
Attackers can correlate ciphertexts due to deterministic AES/CBC encryption with null IVs in Spring Security, requiring specific constructor usage or null IV generators.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47842?
CVE-2026-47842 is a medium-severity vulnerability in Spring Security, published on 26 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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
Weakness: CWE-326
Which versions are affected by CVE-2026-47842?
It affects 1 product.
Products include Vmware Spring Security.
How do I fix CVE-2026-47842?
Upgrade to a fixed version.
Is CVE-2026-47842 being exploited?
There is no known exploitation of CVE-2026-47842 in the wild and no public exploit code.
Other vulnerabilities in Spring Security
- CVE-2014-3527 Authorization Bypass in Spring Security
- CVE-2026-59354 Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
- CVE-2026-59270 Spring Security embedded UnboundID LDAP server exposes well-known administrative bind DN on all network interfaces
- CVE-2026-22732 Under Some Conditions Spring Security HTTP Headers Are not Written
- CVE-2023-34034 Access Control Bypass in Spring Security
Sources
Also known as CLEANSTART-2026-DN56273, CLEANSTART-2026-OS01121, CLEANSTART-2026-QY38876, ECHO-b053-d09f-b66c, GHSA-7274-w8xr-fr2w.