Skip to main content

Allocation of Resources Without Limits or Throttling in io.netty:netty-codec-http

CVE-2026-100655

  • io.netty:netty-codec-http
Medium
6.9/10

Summary

Netty versions through 4.1.137.Final and 4.2.0.Final through 4.2.17.Final accept an unlimited number of concurrent remote-initiated SPDY streams: "SpdySessionHandler" defaults "localConcurrentStreams" to "Integer.MAX_VALUE" and exposes no API to change it. A remote peer that opens a SPDY connection and sends millions of "SYN_STREAM" frames with "FLAG_FIN=0" causes the server to allocate unbounded heap and direct memory, eventually triggering a JVM "OutOfMemoryError" and crashing the service.

  • LOW
  • LOCAL
  • NONE
  • NONE

CWE-770 - Allocation of Resources Without Limits or Throttling

The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

References

Advisory Timeline

  • Published