io.netty/netty-codec-http: Netty: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling

A flaw was found in Netty's HTTP/1 decoder. Incomplete validation of malformed Transfer-Encoding headers allows a remote attacker to perform HTTP request smuggling. By sending specially crafted HTTP requests, an attacker can inject arbitrary HTTP requests, potentially bypassing security controls ...

io.netty/netty-codec-haproxy: Netty: HAProxy PROXY-v2 nested-TLV grandchild ByteBuf reference-count leak (incomplete fix of PR #16881)

A flaw was found in Netty. A reference-count leak in the HAProxy PROXY-v2 message decoder allows a remote, unauthenticated attacker to send specially crafted PROXY-protocol v2 headers. This can lead to memory exhaustion, resulting in a Denial of Service DoS for the affected system...

io.netty/netty-codec-http2: HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target authority

A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2...

io.netty/netty-codec-http: Netty split Transfer-Encoding fields bypass final-chunked validation and enable request smuggling

A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass Transfer-Encoding header validation by splitting the Transfer-Encoding field across multiple headers, with the last field containing a non-final transfer coding like gzip or deflate. This bypass ca...

io.netty/netty-codec-http: Netty: Denial of Service via unbounded SPDY concurrent streams

A flaw was found in Netty. This vulnerability allows a remote attacker to cause a Denial of Service DoS by exhausting server memory. Because the SPDY session handler does not restrict the number of concurrent streams initiated by a remote peer, an attacker can transmit an excessive volume of stre...

io.netty/netty-codec-http: Netty: Denial of Service via unbounded queue growth during HTTP request pipelining

A flaw was found in Netty. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service DoS by sending numerous pipelined HTTP/1.1 requests over a single connection while withholding reads. Netty's HTTP server codec stores unanswered requests in an internal queue...

io.netty/netty-codec-dns: Netty: Denial of Service via Memory Leak in DNS Record Decoder with Malformed Domain Names

A flaw was found in Netty, an asynchronous network application framework. When processing malformed domain names in DNS packets, the DNS record decoder fails to release allocated memory. This vulnerability allows an unauthenticated remote attacker to incrementally leak direct memory, eventually...

io.netty/netty-codec-http: Netty: Denial of Service via unbounded concurrent SPDY streams

A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAXVALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYNSTREAM...

io.netty/netty-codec-http: Netty RtspDecoder Method-Token Smuggling via Trailing Control Byte

A flaw was found in Netty RtspDecoder. The RtspMethods.valueOf function incorrectly strips trailing control bytes from method tokens in Real-Time Streaming Protocol RTSP requests. A remote attacker can exploit this by sending a specially crafted RTSP request, leading to method-token smuggling. Th...

io.netty/netty-codec-http2: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled :authority

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leadi...

io.netty/netty-codec-http2: io.netty/netty-codec-http3: Netty: HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests

A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. Netty's HTTP-object conversion path incorrectly processes these requests as regular HTTP/1.1 CONNECT requests, leading to a loss of critical...

io.netty/netty-codec-http: Netty: HTTP request smuggling via post-digit whitespace in chunk-size parsing

A flaw was found in Netty's netty-codec-http component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an...

io.netty/netty-codec-http2: Netty: HTTP/2 header field values are not validated by default (CR/LF/NUL passthrough)

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary,...

Security Bulletin: IBM Storage Protect Server is affected by an improper domain name validation vulnerability (CVE-2026-42579).

Summary IBM Storage Protect Server uses the netty-codec-dns library in certain components. A vulnerability in netty could allow improper handling of domain names that do not comply with RFC 1035 constraints. An attacker can exploit this through malicious DNS responses or specially crafted...

RHLW-2026-02416B185203289C Lightwell Security Advisory: netty-codec-dns 4.1.132.Final-rhlw-00002

Red Hat Lightwell has released io.netty:netty-codec-dns 4.1.132.Final-rhlw-00002 with a backported security fix. CVE-2026-42579: Netty: DNS Codec Input Validation Bypass in Netty Encoder + Decoder This patched artifact is a drop-in replacement for io.netty:netty-codec-dns 4.1.132.Final from Maven...

RHLW-2026-B66720D53A6E2BA6 Lightwell Security Advisory: netty-codec-stomp 4.1.100.Final-rhlw-00001

Red Hat Lightwell has released io.netty:netty-codec-stomp 4.1.100.Final-rhlw-00001 with backported fixes for CVE-2026-44891 and CVE-2026-59920. CVE-2026-44891: Netty: Denial of Service via Unbounded Headers in StompSubframeDecoder CVE-2026-59920: Netty: STOMP CONNECT Frame Header Injection This...

RHLW-2026-6F1A404174E2316F Lightwell Security Advisory: netty-codec-redis 4.1.100.Final-rhlw-00001

Red Hat Lightwell has released io.netty:netty-codec-redis 4.1.100.Final-rhlw-00001 with backported fixes for CVE-2026-42586, CVE-2026-44250, CVE-2026-44890, CVE-2026-48006, CVE-2026-50011, and CVE-2026-56818. CVE-2026-42586: Netty: CRLF Injection in Netty Redis Codec Encoder CVE-2026-44250: Netty...

RHLW-2026-1CAAFB676CC0F4C9 Lightwell Security Advisory: netty-codec-http2 4.1.100.Final-rhlw-00001

Red Hat Lightwell has released io.netty:netty-codec-http2 4.1.100.Final-rhlw-00001 with backported fixes for CVE-2025-55163, CVE-2026-33871, CVE-2026-42587, CVE-2026-47244, CVE-2026-48043, CVE-2026-50560, CVE-2026-56819, and CVE-2026-59900. CVE-2025-55163: Netty MadeYouReset HTTP/2 DDoS...

RHLW-2026-2E889FEB45FC9875 Lightwell Security Advisory: netty-codec-haproxy 4.1.100.Final-rhlw-00001

Red Hat Lightwell has released io.netty:netty-codec-haproxy 4.1.100.Final-rhlw-00001 with backported fixes for CVE-2026-44893, CVE-2026-48059, CVE-2026-55851, and CVE-2026-59919. CVE-2026-44893: Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length CVE-2026-48059: Netty HAProx...

RHLW-2026-69CA3F0D713E6636 Lightwell Security Advisory: netty-codec-dns 4.1.100.Final-rhlw-00001

Red Hat Lightwell has released io.netty:netty-codec-dns 4.1.100.Final-rhlw-00001 with backported fixes for CVE-2026-42579 and CVE-2026-73508. CVE-2026-42579: Netty: DNS Codec Input Validation Bypass in Netty Encoder + Decoder CVE-2026-73508: Netty: Memory Leak in DNS Record Decoder via Malformed...