Bug 2524636 (CVE-2026-47842)

Summary: CVE-2026-47842 org.springframework.security/spring-security-core: Spring Security: Information disclosure via deterministic AES/CBC encryption
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aschwart, aszczucz, boliveir, drichtar, gmalinko, janstey, mposolda, pdelbell, pjindal, rmartinc, rstepani, sdawley, ssilvert, sthorger, vmuzikar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in Spring Security. Applications configured to use AesBytesEncryptor with a two-argument constructor or a null Initialization Vector (IV) generator in Cipher Block Chaining (CBC) mode will encrypt data using a predictable, all-zero IV. This deterministic encryption allows an attacker to analyze encrypted data and potentially deduce patterns, leading to the disclosure of sensitive information.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-08-26 19:31:54 UTC 
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