Medium severity · published Aug 26, 2026
CVE-2026-47859
Unbounded memory allocation in RFC6587SyslogDeserializer (octet-counted framing) — remote DoS
6.5
CVSS
0.3%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
Spring Integration · Spring
7.1.0; 7.0.0 through 7.0.5; 6.5.0 through 6.5.10; 6.4.0 through 6.4.12; through 5.5.21 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47859
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47859
Vendor Advisory
https://spring.io/security/cve-2026-47859
More from Spring Integration
9.8
CVE-2026-47864
Unsafe Java deserialization in SerializingHttpMessageConverter — remote code execution
9.8
CVE-2019-3772
Spring Integration XML External Entity Injection (XXE)
8.2
CVE-2026-59324
fluxTransform shared RequestMessageHolder causes cross-message header leakage under async fluxFunction
8.0
CVE-2026-59307
Deserialization allow-list silently bypassed: setBeanClassLoader replaces deserializer but mapper keeps stale reference
7.1
CVE-2026-40987
Remote-file synchronizer in Spring Integration writes server-supplied filename under localDirectory without canonicalization