netty has 75 CVEs on record between 2019 and 2026. Cadence is steady at roughly 31 per quarter. The busiest recent month was June 2026 with 19. The median CVSS is 7.5 (high), with 3 rated critical. None have a confirmed exploitation report. The dominant weakness classes are CWE-400 (18) and CWE-770 (18). Most affected products: netty (53), io.netty.incubator:netty-incubator-codec-bhttp (4), io.netty:netty-tcnative (4).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 7.5
- Publish → KEV
- —
- Last 90 days
- 31 prev 32
Weakness classes
Products
- netty 53
- io.netty.incubator:netty-incubator-codec-bhttp 4
- io.netty:netty-tcnative 4
- io.netty:netty-codec-classes-quic 2
- io.netty:netty-codec-http3 2
- io.netty:netty-handler-ssl-ocsp 2
Worst active — by depth score
CVE-2026-45674High· 8.7Netty is a network application framework for development of protocol servers and clients60CVE-2026-100665High· 7.5Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager53CVE-2026-100663High· 7.5Netty's HTTP/3 codec (io.netty:netty-codec-http3) from 4.2.2.Final through 4.2.17.Final does not special-case HTTP/1 CONNECT authority-form request-targets when converting HTTP/1 messages to HTTP/3 in HttpConversionUtil.toHttp3Headers53CVE-2026-100662High· 7.5Netty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPACK encoder-stream instruction decoder (QpackEncoderHandler, installed on the…53CVE-2026-100660High· 7.5Netty's HTTP/3 codec (io.netty:netty-codec-http3) from 4.2.0.Final through 4.2.17.Final retains unbounded per-stream QPACK encoder state53
netty vulnerabilities
CVEs affecting netty, newest first. Open any entry for full detail, references, and exploit status.
75 CVEsRSS
CVE-2026-116539Medium· 5.9Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO
Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshak…
CVE-2026-116541Medium· 5.9netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like Ne…
CVE-2026-116542Medium· 5.3Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding
Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter hostnames via JNI NewStringUTF decoding. Attackers can send overlong encodings like 0xC0 0x80 in…
CVE-2026-116540Medium· 5.9netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback
netty-tcnative 2.0.66.Final before 2.0.84.Final built against OpenSSL 3.x contains a use-after-free vulnerability in ssl_tlsext_ticket_key_cb during session ticket key rotation. Remote clients performing TLS handshakes while setSessionTi…
CVE-2026-100658Medium· 5.3Rejected reason: This CVE ID has been rejected as a duplicate.
Rejected reason: This CVE ID has been rejected as a duplicate.
CVE-2026-100656High· 7.5PoCRejected reason: This CVE ID has been rejected as a duplicate.
Rejected reason: This CVE ID has been rejected as a duplicate.
CVE-2026-100657High· 7.5Rejected reason: This CVE ID has been rejected as a duplicate.
Rejected reason: This CVE ID has been rejected as a duplicate.
CVE-2026-100655High· 7.5Rejected reason: This CVE ID has been rejected as a duplicate.
Rejected reason: This CVE ID has been rejected as a duplicate.
CVE-2026-100663High· 7.5PoCNetty's HTTP/3 codec (io.netty:netty-codec-http3) from 4.2.2.Final through 4.2.17.Final does not special-case HTTP/1 CONNECT authority-form request-targets when converting HTTP/1 messages to HTTP/3 in HttpConversionUtil.toHttp3Headers
Netty's HTTP/3 codec (io.netty:netty-codec-http3) from 4.2.2.Final through 4.2.17.Final does not special-case HTTP/1 CONNECT authority-form request-targets when converting HTTP/1 messages to HTTP/3 in HttpConversionUtil.toHttp3Headers. T…
CVE-2026-100662High· 7.5PoCNetty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPACK encoder-stream instruction decoder (QpackEncoderHandler, installed on the…
Netty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPACK encoder-stream instruction decoder (QpackEncoderHandler, installed on the…
CVE-2026-100661High· 7.5Netty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.0.Final through 4.2.17.Final contain a denial-of-service vulnerability in the QPACK prefixed-integer decoder (QpackUtil.decodePrefixedInteger), which does not bound the numbe…
Netty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.0.Final through 4.2.17.Final contain a denial-of-service vulnerability in the QPACK prefixed-integer decoder (QpackUtil.decodePrefixedInteger), which does not bound the numbe…
CVE-2026-100666High· 7.3PoCNetty's HttpServerCodec (io.netty:netty-codec-http) in versions 4.2.0.Final through 4.2.16.Final and in versions up to and including 4.1.136.Final pairs each outbound response with an inbound request by calling pollMethod() once per resp…
Netty's HttpServerCodec (io.netty:netty-codec-http) in versions 4.2.0.Final through 4.2.16.Final and in versions up to and including 4.1.136.Final pairs each outbound response with an inbound request by calling pollMethod() once per resp…
CVE-2026-100665High· 7.5PoCNetty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager
Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEn…
CVE-2026-100659Medium· 6.5Netty's HTTP/3 codec (io.netty:netty-codec-http3) in versions 4.2.0.Final through 4.2.17.Final does not enforce the RFC 9114 requirement that the :authority pseudo-header field and a literal host header field, when both present, carry th…
Netty's HTTP/3 codec (io.netty:netty-codec-http3) in versions 4.2.0.Final through 4.2.17.Final does not enforce the RFC 9114 requirement that the :authority pseudo-header field and a literal host header field, when both present, carry th…
CVE-2026-100664High· 7.5Netty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.2.Final through 4.2.17.Final builds the HTTP/3 :authority pseudo-header from the HTTP/1 Host header before considering the authority of an absolute-form HTTP/1 request-target…
Netty's HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.2.Final through 4.2.17.Final builds the HTTP/3 :authority pseudo-header from the HTTP/1 Host header before considering the authority of an absolute-form HTTP/1 request-target…
CVE-2026-100660High· 7.5PoCNetty's HTTP/3 codec (io.netty:netty-codec-http3) from 4.2.0.Final through 4.2.17.Final retains unbounded per-stream QPACK encoder state
Netty's HTTP/3 codec (io.netty:netty-codec-http3) from 4.2.0.Final through 4.2.17.Final retains unbounded per-stream QPACK encoder state. QpackEncoder stores a queue and a dynamic-table index tracker for every encoded field section that …
CVE-2026-54251High· 8.7netty-incubator-codec-ohttp implements Oblivious HTTP (OHTTP) gateway and client functionality using Netty
netty-incubator-codec-ohttp implements Oblivious HTTP (OHTTP) gateway and client functionality using Netty. Prior to 0.0.23.Final, the OHTTP gateway decryption path in codec-ohttp/src/main/java/io/netty/incubator/codec/ohttp/OHttpRequest…
CVE-2026-89044Medium· 6.5Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encod…
Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encod…
CVE-2026-62380High· 7.5Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEn…
Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEn…
CVE-2026-61798High· 8.1netty-incubator-codec-ohttp: BoringSSL HPKE private key bytes exposed through toString() and exception messages
netty-incubator-codec-ohttp: BoringSSL HPKE private key bytes exposed through toString() and exception messages
CVE-2026-61799Medium· 5.3netty-incubator-codec-ohttp: Binary HTTP parser unchecked varint length overflow causes decoder crash
netty-incubator-codec-ohttp: Binary HTTP parser unchecked varint length overflow causes decoder crash
CVE-2026-63124High· 7.5netty-incubator-codec-ohttp: Binary HTTP parser infinite loop on known-length field section boundary
netty-incubator-codec-ohttp: Binary HTTP parser infinite loop on known-length field section boundary
CVE-2026-61827Highnetty-incubator-codec-ohttp: BinaryHttpParser should enforce limits for variable lengths fields
netty-incubator-codec-ohttp: BinaryHttpParser should enforce limits for variable lengths fields
CVE-2026-63202High· 7.5netty-incubator-codec-ohttp BinaryHttpParser: Unauthenticated CPU-exhaustion DoS via infinite loop in field-section decoding
netty-incubator-codec-ohttp BinaryHttpParser: Unauthenticated CPU-exhaustion DoS via infinite loop in field-section decoding
CVE-2026-75596High· 7.5Netty is an asynchronous, event-driven network application framework
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.ssl.SniHandler constructors use the pre-handshake ClientHello aggregation path in handler/src/mai…
CVE-2026-75595Critical· 9.1Netty is an asynchronous, event-driven network application framework
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandler#decode checks the wrong offset before reading the four-byte TLS handshake header, so…
CVE-2026-59903Medium· 6.5PoCNetty is an asynchronous, event-driven network application framework
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie w…
CVE-2026-59902High· 7.5Netty is an asynchronous, event-driven network application framework
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.sctp.SctpMessageCompletionHandler limits incomplete messages and fragment counts but not maxBufferedByt…
CVE-2026-73508Medium· 5.3⚖ disputedNetty is an asynchronous, event-driven network application framework
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.…
CVE-2026-73507High· 7.5Netty is an asynchronous, event-driven network application framework
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.xml.XmlFrameDecoder.decode() failed to preserve closing-tag parser state across invocations, so an unau…