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.
使用 时，若通过双参数构造函数创建实例，或在 CBC 加密模式下传入空的 IV 生成器（null IV generator），则数据将使用 AES/CBC 模式进行加密，且初始化向量（IV）为全零（null/all-zero）。 受影响的 Spring Security 版本： 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
Possible ATT&CK Techniques 1 AI
T1565.002 · Transmitted Data ManipulationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Spring | Spring Security | 7.1.0 | - |
|
II. Public POCs for CVE-2026-47842
| # | POC Description | Source Link | Shenlong Link |
|---|
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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 |
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