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CVE-2026-47842— Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Correlation

Quick assessment

Affected
Spring Spring Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

VMware Spring Security是美国VMware公司开源的一套为Spring应用提供安全保护的安全框架。 VMware Spring Security 7.1.0版本、7.0.0至7.0.6版本、6.5.0至6.5.11版本、6.4.0至6.4.18版本、5.8.0至5.8.27版本和5.7.0至5.7.25版本存在加密问题漏洞，该漏洞源于AesBytesEncryptor使用双参数构造函数或传递空IV生成器并采用CBC加密模式时，使用全零初始化向量加密数据，可能导致信息泄露。

CVSS 6.5 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1565.002 · Transmitted Data Manipulation

Affected Version Matrix 6

VendorProduct Version RangeStatus
Spring Spring Security 7.1.0 affected
7.0.0≤ 7.0.6 affected
6.5.0≤ 6.5.11 affected
6.4.0≤ 6.4.18 affected
5.8.0≤ 5.8.27 affected
5.7.0≤ 5.7.25 affected
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I. Basic Information for CVE-2026-47842

Vulnerability Information
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Vulnerability Title
Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Correlation
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
VMware Spring Security 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
VMware Spring Security是美国VMware公司开源的一套为Spring应用提供安全保护的安全框架。 VMware Spring Security 7.1.0版本、7.0.0至7.0.6版本、6.5.0至6.5.11版本、6.4.0至6.4.18版本、5.8.0至5.8.27版本和5.7.0至5.7.25版本存在加密问题漏洞，该漏洞源于AesBytesEncryptor使用双参数构造函数或传递空IV生成器并采用CBC加密模式时，使用全零初始化向量加密数据，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Spring Spring Security 7.1.0 -

II. Public POCs for CVE-2026-47842

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III. Intelligence Information for CVE-2026-47842

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Vendor Advisories for CVE-2026-47842 (1)

Same Patch Batch · Spring · 2026-08-26 · 20 CVEs total

CVE-2026-47852 7.5 HIGH Predictable cache directory location allows local ONNX model substitution in Spring AI
CVE-2026-47851 7.5 HIGH Unbounded recursion over attacker-controlled PDF outline tree in Spring AI PDF Document Re
CVE-2026-47841 7.4 HIGH WebAuthn User Verification Bypass via Session Serialization
CVE-2026-47836 7.2 HIGH Spring Cloud Config Server Susceptible To TOCTOU Attack When Using SVN
CVE-2026-47837 6.8 MEDIUM Spring Cloud Config Server Monitor Endpoint Does Not Validate Webhook Requests
CVE-2026-47860 6.5 MEDIUM Unbounded decompression of attacker-supplied compressed message bodies
CVE-2026-47861 6.3 MEDIUM UDP adapter sends ack to attacker-supplied host:port parsed from packet body, even when ac
CVE-2026-47856 6.3 MEDIUM JsonToObjectTransformer resolves the json__TypeId__ message header to an arbitrary class w
CVE-2026-47848 6.1 MEDIUM Reactor Netty WebSocket Client Leaks Credentials On Redirect
CVE-2026-47863 5.9 MEDIUM Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream deli
CVE-2026-47857 5.9 MEDIUM Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around
CVE-2026-47862 5.4 MEDIUM ZipTransformer uses file_name header to build workDirectory path without sanitization
CVE-2026-47859 5.4 MEDIUM Unbounded memory allocation in RFC6587SyslogDeserializer (octet-counted framing) — remote
CVE-2026-47844 5.3 MEDIUM Reactor Netty HTTP Server Leaks Exception Details
CVE-2026-47845 5.3 MEDIUM Reactor Netty HTTP Server may incorrectly evaluate proxy addresses
CVE-2026-47874 5.3 MEDIUM Reactor Netty HTTP Server Denial of Service With Pipelined Requests
CVE-2026-47834 4.8 MEDIUM Spring Data JPA Sort expression validation bypass
CVE-2026-47850 4.3 MEDIUM Spring Data REST allows mutation of the version property of immutable aggregates via PUT
CVE-2026-47843 3.7 LOW Reactor Netty may incorrectly route traffic due to DNS resolver reuse

IV. Related Vulnerabilities

Same product: Spring Security
Same vendor: Spring

V. Comments for CVE-2026-47842

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