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CVE-2026-44893— Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length

Quick assessment

Affected
netty netty
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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存在异常处理不当漏洞，该漏洞源于netty-codec-haproxy中HAProxyMessage.readNextTLV方法在解码PP2_TYPE_SSL TLV时异常处理不当，可能导致内存泄露。以下版本受到影响：4.1.135.Final之前版本和4.2.15.Final之前版本。

CVSS 7.5 · High EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty >= 4.2.0.Final, < 4.2.15.Final affected
< 4.1.135.Final affected
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I. Basic Information for CVE-2026-44893

Vulnerability Information
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Vulnerability Title
Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is a network application framework for development of protocol servers and clients. In netty-codec-haproxy prior to versions 4.1.135.Final and 4.2.15.Final, when decoding a PP2_TYPE_SSL TLV, HAProxyMessage.readNextTLV() first calls `header.retainedSlice(header.readerIndex(), length)` and only then reads the 1-byte client field and 4-byte verify field. If the attacker sets the TLV length below 5, the subsequent readByte/readInt throws IndexOutOfBoundsException. HAProxyMessageDecoder only catches HAProxyProtocolException around this call, so the IOOBE propagates and the retained slice on the pooled cumulation buffer is never released. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 异常处理不当漏洞
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存在异常处理不当漏洞，该漏洞源于netty-codec-haproxy中HAProxyMessage.readNextTLV方法在解码PP2_TYPE_SSL TLV时异常处理不当，可能导致内存泄露。以下版本受到影响：4.1.135.Final之前版本和4.2.15.Final之前版本。
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

Vendor Product Affected Versions CPE Subscribe
netty netty >= 4.2.0.Final, < 4.2.15.Final -

II. Public POCs for CVE-2026-44893

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 13322 chars
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III. Intelligence Information for CVE-2026-44893

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Vendor Advisories for CVE-2026-44893 (1)

Vendor Pages for CVE-2026-44893 (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-2026-48059 8.7 HIGH Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memo
CVE-2026-48006 8.7 HIGH Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregator
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-2026-46340 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-2026-47244 5.3 MEDIUM Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced
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

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-703

V. Comments for CVE-2026-44893

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