CVE-2026-100655
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
Netty (io.netty:netty-codec-http) versions up to and including 4.1.137.Final and from 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. Fixed in 4.1.138.Final and 4.2.18.Final.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| netty | netty | 0 < 4.1.138.Final | affected |
| netty | netty | 4.1.138.Final | unaffected |
| netty | netty | 4.2.0.Final < 4.2.18.Final | affected |
| netty | netty | 4.2.18.Final | unaffected |
Weaknesses
- CWE-770: Allocation of Resources Without Limits or Throttling
References
- https://github.com/netty/netty/security/advisories/GHSA-rmcw-9fcq-wjq7
- https://www.vulncheck.com/advisories/netty-before-4.1.138-final-denial-of-service-via-spdysessionhandler
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