CVE-2026-47244— Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced
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I. Basic Information for CVE-2026-47244
Vulnerability Information
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Vulnerability Title
Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced
Source: NVD (National Vulnerability Database)
Vulnerability Description
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Netty 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty团队开源的一款非阻塞I/O客户端-服务器框架, 它主要用于开发Java网络应用程序,如协议服务器和客户端等。 Netty 4.1.135.Final之前版本和4.2.15.Final之前版本存在资源管理错误漏洞，该漏洞源于DefaultHttp2Connection.DefaultEndpoint将maxActiveStreams/maxStreams初始化为Integer.MAX_VALUE且Http2Settings默认不插入SETTINGS_MAX_CONCURRENT_STR
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-47244
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Vendor Advisories for CVE-2026-47244 (1)
Vendor Pages for CVE-2026-47244 (2)
Same Patch Batch · netty · 2026-06-12 · 19 CVEs total
| CVE-2026-45674 | 8.7 HIGH | Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records |
| CVE-2026-47691 | 8.7 HIGH | Netty has Insufficient Bailiwick Validation for NS Records |
| CVE-2026-44892 | 7.5 HIGH | Netty has a Vulnerable Default Configuration Which Leads to Denial of Service via Unbounde |
| CVE-2026-44894 | 7.5 HIGH | Netty's Default QUIC token handler accepts any client-supplied token |
| CVE-2026-44893 | 7.5 HIGH | Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length |
| CVE-2026-46340 | 7.5 HIGH | Netty: SCTP reassembly nests buffers without bound |
| CVE-2026-50011 | 7.5 HIGH | Netty has unbounded pre-allocation in RedisArrayAggregator from RESP array length |
| CVE-2026-50010 | 7.5 HIGH | Netty's wrapping plain trust manager silently disables hostname verification |
| CVE-2026-48748 | 7.5 HIGH | Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion |
| CVE-2026-45416 | 7.5 HIGH | Netty: SNI handler pre-allocates up to 16 MiB from nine attacker bytes |
| CVE-2026-45673 | 6.8 MEDIUM | Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port |
| CVE-2026-48043 | 5.3 MEDIUM | netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Lea |
| CVE-2026-50020 | 5.3 MEDIUM | Netty's HttpObjectDecoder skips arbitrary initial control characters when only initial CRL |
| CVE-2026-50009 | 4.8 MEDIUM | Netty QUIC stateless reset token material exposed through header-visible connection IDs |
| CVE-2026-45536 | 4.0 MEDIUM | Netty: Unix-socket fd receive leaks descriptors when peer sends two at once |
| CVE-2026-50560 | Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature | |
| CVE-2026-48006 | Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregator | |
| CVE-2026-48059 | Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memo |
IV. Related Vulnerabilities
Same product: netty
- CVE-2026-50560
Netty susceptible to HTTP/2 Reset Attack with different on-t - CVE-2026-50020
Netty's HttpObjectDecoder skips arbitrary initial control ch - CVE-2026-50011
Netty has unbounded pre-allocation in RedisArrayAggregator f - CVE-2026-50010
Netty's wrapping plain trust manager silently disables hostn - CVE-2026-50009
Netty QUIC stateless reset token material exposed through he
Same vendor: netty
- CVE-2026-50560
Netty susceptible to HTTP/2 Reset Attack with different on-t - CVE-2026-50020
Netty's HttpObjectDecoder skips arbitrary initial control ch - CVE-2026-50011
Netty has unbounded pre-allocation in RedisArrayAggregator f - CVE-2026-50010
Netty's wrapping plain trust manager silently disables hostn - CVE-2026-50009
Netty QUIC stateless reset token material exposed through he
Same weakness: CWE-400
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