Netty has a Vulnerable Default Configuration Which Leads to Denial of Service via Unbounded HTTP/3 Header Size

Summary The default configuration of the Http3ConnectionHandler in the Netty HTTP/3 codec lacks an enforced maximum header size limit. When a peer does not explicitly specify HTTP3SETTINGSMAXFIELDSECTIONSIZE, the implementation defaults to an unbounded limit. This insecure default configuration...

PT-2026-47563

Summary The default configuration of the Http3ConnectionHandler in the Netty HTTP/3 codec lacks an enforced maximum header size limit. When a peer does not explicitly specify HTTP3 SETTINGS MAX FIELD SECTION SIZE, the implementation defaults to an unbounded limit. This insecure default...

PT-2026-48900

Name of the Vulnerable Software and Affected Versions Netty versions 4.2.0.Final through 4.2.14.Final Description A memory exhaustion issue exists in the Netty HTTP/3 codec within the io.netty.handler.codec.http3.QpackDecoder component. The flaw occurs in the shouldWaitForDynamicTableUpdates...

PT-2026-51740

Name of the Vulnerable Software and Affected Versions cURL affected versions not specified libcurl affected versions not specified Description An issue in the QUIC UDP receive function allows a remote malicious HTTP/3 server to cause a denial of service. The helper function fails to count...

CVE-2026-40898 quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field...

CVE-2026-40898 quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field...

traefik -- Multiple vulnerabilities

The traefik project releases a new version addressing multiple CVEs: CVE-2026-48020 StripPrefix Route-Level Auth Bypass CVE-2026-48491 SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypass HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the processing of QPACK-encoded HEADERS frames containing trailer field sections. An attacker can cause excessive memory allocation by sending specially crafted frames with ma...

PT-2026-46115

Name of the Vulnerable Software and Affected Versions quic-go affected versions not specified Description An attacker can trigger excessive memory allocation in the HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame. This frame decodes into a large trailer field...

USN-8354-1: nginx vulnerabilities

It was discovered that nginx did not properly validate source addresses in the HTTP/3 QUIC module. A remote attacker could possibly use this issue to bypass authorization checks or rate limiting. This issue only affected Ubuntu 25.04 and Ubuntu 25.10. CVE-2026-40460 It was discovered that nginx...

USN-8354-1 nginx vulnerabilities

It was discovered that nginx did not properly validate source addresses in the HTTP/3 QUIC module. A remote attacker could possibly use this issue to bypass authorization checks or rate limiting. This issue only affected Ubuntu 25.04 and Ubuntu 25.10. CVE-2026-40460 It was discovered that nginx...

Tenable Sensor Proxy < 1.4.0 Multiple Vulnerabilities (TNS-2026-15)

According to its self-reported version, the Tenable Sensor Proxy running on the remote host is prior to 1.4.0. It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2026-15 advisory. - When NGINX Plus or NGINX OSS are configured to use the HTTP/3 QUIC module, undisclosed...

Amazon Linux 2 : nginx, --advisory ALAS2NGINX1-2026-012 (ALASNGINX1-2026-012)

The version of nginx installed on the remote host is prior to 1.30.1-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2NGINX1-2026-012 advisory. When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof...

Amazon Linux 2023 : nginx, nginx-all-modules, nginx-core (ALAS2023-2026-1714)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1714 advisory. When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of ra...

CVE-2026-47070

Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackneyh3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request...

CVE-2026-47077

Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackneyh3:awaitresponseloop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk,...

Important: nginx

Issue Overview: When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting. Note: Software versions which have reached End of Technical Support EoTS are...

EEF-CVE-2026-47070 HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney

Summary Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney\h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/...

CVE-2026-47070

The vulnerability CVE-2026-47070 affects the Hackney HTTP client. It specifically concerns the HTTP/3 redirect handler (src/hackney_h3.erl) which forwards the original request headers to the redirect target without any cross-origin checking when follow_redirect is enabled. This causes Authorizati...

CVE-2026-47070 HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney

Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackneyh3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request...