CVE-2026-88878

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying...

CVE-2026-88878 Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying...

CVE-2026-88878 Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying...

CVE-2026-88878 Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying...

CVE-2026-88012: Allocation of Resources Without Limits or Throttling

Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream...

PT-2026-89688

Summary There is a medium severity vulnerability in Traefik's HTTP/3 entry points: the respondingTimeouts settings were not applied to the HTTP/3 request path. readTimeout in particular is on by default at 60s and is documented as bounding the time to read the entire request including its body, b...

CVE-2026-88007: Improper Authentication

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection...

PT-2026-89698

Summary Traefik's HTTP/3 request path did not initialize the connection-scoped backend transport holder that isolates connection-bound NTLM and Negotiate Kerberos authentication on the HTTP/1.1 and HTTP/2 paths. The HTTP/3 entrypoint reuses the HTTPS handler chain and reaches the same backend...

PT-2026-89389

Name of the Vulnerable Software and Affected Versions Traefik versions 2.8.2 through 2.11.55 Traefik versions 3.0.0 through 3.7.11 Description In entry points with HTTP/3 enabled, the respondingTimeouts settings—specifically the readTimeout variable, which defaults to 60 seconds—are not applied t...

PT-2026-89455

Name of the Vulnerable Software and Affected Versions Traefik versions 2.11.0 through 2.11.56 Traefik versions prior to 3.7.13 Description An authentication bypass exists in the HTTP/3 request path where the ConnContext fails to call the service.AddTransportOnContext function. This causes the...

CVE-2026-88878: Allocation of Resources Without Limits or Throttling

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through = v3.7.11, the entryPoints. .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a...

PT-2026-89473

Name of the Vulnerable Software and Affected Versions Traefik versions 2.8.2 through 2.11.55 Traefik versions 3.0 through 3.7.11 Description HTTP/3 entrypoints fail to apply the readTimeout setting located in entryPoints..transport.respondingTimeouts.readTimeout. While this timeout is intended to...

Fedora 43 : curl (2026-f903f9ff11)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f903f9ff11 advisory. - fix proto-default skips SSH verification CVE-2026-12064 - fix wrong STARTTLS connection reuse CVE-2026-8286 - fix SASL double-free CVE-2026-8925 -...

haproxy: HAProxy: HTTP Request Smuggling via HTTP/3 Multiplexer Desynchronization

A flaw was found in HAProxy. A remote, unauthenticated attacker can exploit a vulnerability in the HTTP/3 multiplexer when processing requests without a Content-Length header, leading to HTTP request smuggling. This occurs when HAProxy is configured with QUIC support and an HTTP/3 frontend, and...

cowlib: Cowlib: Denial of Service due to unbounded HPACK/QPACK prefixed-integer decoding

A flaw was found in cowlib, an HTTP parser. An unauthenticated remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 frames containing oversized HPACK or QPACK prefixed integers. This unbounded decoding process leads to excessive memory allocation and...

CDN Tsunami Attack Abuses HTTP/3 Translation for Up to 350x DoS Amplification

Cybersecurity researchers have disclosed two denial-of-service DoS attacks that exploit how major content delivery networks CDNs convert client-facing HTTP/3 traffic into HTTP/1.1 requests to the websites they front, amplifying a low-bandwidth request stream by up to 350x against the origin serve...

libcurl: libcurl: Information disclosure via cached SSL session and early data

A flaw was found in libcurl. An attacker can exploit this by replacing a legitimate HTTP/3 server with an impostor machine. When libcurl attempts a second transfer to the same site with a cached SSL session and early data enabled, it may send sensitive request data before verifying the server's...

CVE-2026-49457

erlangquic is a pure Erlang QUIC implementation. Prior to version 1.4.4, the QUIC client did not authenticate the server during the TLS 1.3 handshake. The CertificateVerify signature was not checked, the certificate chain was not validated, and the hostname was not compared against the certificat...

EUVD-2026-58756

erlangquic is a pure Erlang QUIC implementation. Prior to version 1.4.4, the QUIC client did not authenticate the server during the TLS 1.3 handshake. The CertificateVerify signature was not checked, the certificate chain was not validated, and the hostname was not compared against the certificat...

CVE-2026-49457 QUIC has Broken TLS verification

erlangquic is a pure Erlang QUIC implementation. Prior to version 1.4.4, the QUIC client did not authenticate the server during the TLS 1.3 handshake. The CertificateVerify signature was not checked, the certificate chain was not validated, and the hostname was not compared against the certificat...