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CVE-2026-46340— Netty: SCTP reassembly nests buffers without bound

CVSS 7.5 · High EPSS 0.61% · P44

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
nettynetty>= 4.2.0.Final, < 4.2.15.Finalaffected
< 4.1.135.Finalaffected
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I. Basic Information for CVE-2026-46340

Vulnerability Information
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Vulnerability Title
Netty: SCTP reassembly nests buffers without bound
Source: NVD (National Vulnerability Database)
Vulnerability Description
Netty is a network application framework for development of protocol servers and clients. In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does `fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf))`, wrapping the previous accumulator and the new slice into a *new* CompositeByteBuf every time. After N fragments the accumulator is an N-deep chain of composites, each holding references and component arrays; readableBytes()/getBytes() on the final buffer recurse N levels. There is no limit on N, on total bytes, or on the number of streamIdentifiers an attacker can open (each gets its own map entry). A peer that never sets the `complete` flag can grow this structure indefinitely from tiny 1-byte DATA chunks. 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:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
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，该漏洞源于对SctpMessage片段处理不当，可能导致攻击者通过构造大量非完整的SctpMessage片段来无限制地增长CompositeByteBuf结构，从而造成拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
nettynetty >= 4.2.0.Final, < 4.2.15.Final -

II. Public POCs for CVE-2026-46340

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 12137 chars
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III. Intelligence Information for CVE-2026-46340

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Vendor Advisories for CVE-2026-46340 (1)

Vendor Pages for CVE-2026-46340 (2)

Same Patch Batch · netty · 2026-06-12 · 19 CVEs total

CVE-2026-456748.7 HIGHNetty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records
CVE-2026-476918.7 HIGHNetty has Insufficient Bailiwick Validation for NS Records
CVE-2026-448927.5 HIGHNetty has a Vulnerable Default Configuration Which Leads to Denial of Service via Unbounde
CVE-2026-448947.5 HIGHNetty's Default QUIC token handler accepts any client-supplied token
CVE-2026-448937.5 HIGHNetty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length
CVE-2026-500117.5 HIGHNetty has unbounded pre-allocation in RedisArrayAggregator from RESP array length
CVE-2026-500107.5 HIGHNetty's wrapping plain trust manager silently disables hostname verification
CVE-2026-487487.5 HIGHNetty HTTP/3 QPACK Blocked Streams Memory Exhaustion
CVE-2026-454167.5 HIGHNetty: SNI handler pre-allocates up to 16 MiB from nine attacker bytes
CVE-2026-456736.8 MEDIUMNetty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port
CVE-2026-480435.3 MEDIUMnetty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Lea
CVE-2026-472445.3 MEDIUMNetty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced
CVE-2026-500205.3 MEDIUMNetty's HttpObjectDecoder skips arbitrary initial control characters when only initial CRL
CVE-2026-500094.8 MEDIUMNetty QUIC stateless reset token material exposed through header-visible connection IDs
CVE-2026-455364.0 MEDIUMNetty: Unix-socket fd receive leaks descriptors when peer sends two at once
CVE-2026-48006Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregator
CVE-2026-48059Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memo
CVE-2026-50560Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-770

V. Comments for CVE-2026-46340

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