Medium severity · published Aug 26, 2026
CVE-2026-47874
Reactor Netty HTTP Server Denial of Service With Pipelined Requests
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory.
Reactor Netty 1.3.0 - 1.3.6
Reactor Netty 1.1.0 - 1.2.18
Reactor Netty 1.0.52 and earlier
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RN
Reactor Netty · Spring
1.3.0 through 1.3.6; 1.1.0 through 1.2.18; through 1.0.52 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47874
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47874
Vendor Advisory
https://spring.io/security/cve-2026-47874
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