UBUNTU-CVE-2026-100659

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 the same value. A remote unauthenticated peer can send a single...

CVE-2026-100664 Netty 4.2.2 through 4.2.17 HTTP/1 Host Header Authority Confusion

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. In HttpConversionUtil.toHttp3HeadersHttpMessage, boolean —...

CVE-2026-100664

The Netty HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.2.Final through 4.2.17.Final is vulnerable to authority confusion . In the HttpConversionUtil.toHttp3Headers method, a non-empty Host header takes precedence over the request-target authority during HTTP/1-to-HTTP/3 conversion, viol...

CVE-2026-100664 Netty 4.2.2 through 4.2.17 HTTP/1 Host Header Authority Confusion

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. In HttpConversionUtil.toHttp3HeadersHttpMessage, boolean —...

EUVD-2026-87758

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. In HttpConversionUtil.toHttp3HeadersHttpMessage, boolean —...

CVE-2026-100664

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. In HttpConversionUtil.toHttp3HeadersHttpMessage, boolean —...

CVE-2026-100664

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. In HttpConversionUtil.toHttp3HeadersHttpMessage, boolean —...

CVE-2026-100663

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. The authority-form target e.g., "CONNECT trusted.example:443" i...

CVE-2026-100663 Netty HTTP/1 CONNECT authority-form mistranslated to malformed HTTP/3

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. The authority-form target e.g., "CONNECT trusted.example:443" i...

EUVD-2026-87757

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. The authority-form target e.g., "CONNECT trusted.example:443" i...

CVE-2026-100663 Netty HTTP/1 CONNECT authority-form mistranslated to malformed HTTP/3

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. The authority-form target e.g., "CONNECT trusted.example:443" i...

CVE-2026-100663 Netty HTTP/1 CONNECT authority-form mistranslated to malformed HTTP/3

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. The authority-form target e.g., "CONNECT trusted.example:443" i...

CVE-2026-100663

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. The authority-form target e.g., "CONNECT trusted.example:443" i...

CVE-2026-100663

Netty's HTTP/3 codec (io.netty:netty-codec-http3 ) versions 4.2.2.Final through 4.2.17.Final are vulnerable to a request smuggling or bypass issue in HttpConversionUtil.toHttp3Headers. The root cause is the failure to special-case HTTP/1 CONNECT authority-form request-targets during HTTP/1-to-HTT...

CVE-2026-100662 Netty HTTP/3 QPACK encoder-stream unbounded memory exhaustion DoS

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 peer-initiated unidirectional QPACK encoder stream, type 0x02...

CVE-2026-100662

Netty's HTTP/3 codec (io.netty:netty-codec-http3 ) versions 4.2.0.Final through 4.2.17.Final are vulnerable to an uncontrolled resource consumption flaw in the QpackEncoderHandler (QPACK encoder-stream instruction decoder). The handler fails to enforce limits on the Name Length and Value Length f...

CVE-2026-100662 Netty HTTP/3 QPACK encoder-stream unbounded memory exhaustion DoS

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 peer-initiated unidirectional QPACK encoder stream, type 0x02...

EUVD-2026-87756

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 peer-initiated unidirectional QPACK encoder stream, type 0x02...

CVE-2026-100662

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 peer-initiated unidirectional QPACK encoder stream, type 0x02...

CVE-2026-100661

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 number of continuation bytes it will process. A remote, unauthenticat...