CVE-2026-47859— Unbounded memory allocation in RFC6587SyslogDeserializer (octet-counted framing) — remote DoS
Quick assessment
Affected
Spring Spring Integration
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.
RFC 6587 日志反序列化器（由 Spring Integration 的 syslog TCP 入站适配器用于解码 RFC 6587 / RFC 5424 帧）信任发送方提供的八进制计数帧的八进制计数，并据此分配一个恰好为该大小的字节数组，且未设置上限。 受影响版本： Spring Integration 7.1.0 Spring Integration 7.0.0 - 7.0.5 Spring Integration 6.5.0 - 6.5.10 Spring Integration 6.4.0 - 6.4
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-47859
Vulnerability Information
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Vulnerability Title
Unbounded memory allocation in RFC6587SyslogDeserializer (octet-counted framing) — remote DoS
Source: CVE Program / CVE List V5
Vulnerability Description
RFC6587SyslogDeserializer, used by the Spring Integration syslog TCP inbound adapter to decode RFC 6587 / RFC 5424 frames, trusts the sender-supplied octet count of an octet-counted frame and allocates a byte array of exactly that size with no upper bound.
Spring Integration 7.1.0
Spring Integration 7.0.0 - 7.0.5
Spring Integration 6.5.0 - 6.5.10
Spring Integration 6.4.0 - 6.4.12
Spring Integration 5.5.21 and earlier
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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 Integration | 7.1.0 | - |
|
II. Public POCs for CVE-2026-47859
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-47859 (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-2026-47842 | 6.5 MEDIUM | Deterministic AES/CBC Encryption in Spring Security AesBytesEncryptor Allows Ciphertext Co |
| CVE-2026-47856 | 6.3 MEDIUM | JsonToObjectTransformer resolves the json__TypeId__ message header to an arbitrary class w |
| CVE-2026-47861 | 6.3 MEDIUM | UDP adapter sends ack to attacker-supplied host:port parsed from packet body, even when ac |
| 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-2026-47845 | 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-2026-47844 | 5.3 MEDIUM | Reactor Netty HTTP Server Leaks Exception Details |
| 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 Integration
-
CVE-2026-47861
UDP adapter sends ack to attacker-supplied host:port parsed -
CVE-2026-47862
ZipTransformer uses file_name header to build workDirectory -
CVE-2026-47856
JsonToObjectTransformer resolves the json__TypeId__ message -
CVE-2026-40987
Remote-file synchronizer in Spring Integration writes server -
CVE-2020-5413
Kryo Configuration Allows Code Execution with Unknown "Seria
Same vendor: Spring
-
CVE-2026-47874
Reactor Netty HTTP Server Denial of Service With Pipelined R -
CVE-2026-47861
UDP adapter sends ack to attacker-supplied host:port parsed -
CVE-2026-47863
Reactor Core bufferTimeout fair-backpressure pipeline perman -
CVE-2026-47862
ZipTransformer uses file_name header to build workDirectory -
CVE-2026-47860
Unbounded decompression of attacker-supplied compressed mess
V. Comments for CVE-2026-47859
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