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-2026-89688

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...

PT-2026-89455

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-2026-89389

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...

PT-2026-89473

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...

CVE-2026-33555

HTTP Request Smuggling via HAProxy H3/QUIC Standalone FIN Body Validation Bypass Full post here : https://r3verii.github.io/cve/2026/04/14/haproxy-h3-standalone-fin-smuggling.html Summary A vulnerability in HAProxy's HTTP/3 implementation allows an attacker to send an HTTP request with a...

CVE-2026-4253-Scanner

CVE-2026-42530 — Safe-Check Scanner Non-destructive mass scanner for the NGINX HTTP/3 QUIC use-after-free Inventory which of your hosts are exposed — without ever triggering the bug. ⚠️ Disclaimer This tool is for authorized security testing only — your own infrastructure, or systems you have...

CVE-2026-42530

CVE-2026-42530 Scanner for CVE-2026-42530, a use-after-free in nginx's HTTP/3 module. Affected: nginx 1.31.0, 1.31.1 Fixed: nginx 1.31.2 Usage root@kitploit: pip install aioquic python3 scannerCVE-2026-42530.py port python3 scannerCVE-2026-42530.py --file hosts.txt How it works Opens two QPACK...

CVE-2026-42530

🛡️ CVE-2026-42530 - NGINX HTTP/3 QUIC Use-After-Free Vulnerability High-Severity Use-After-Free in NGINX HTTP/3 QUIC ⚠️ QPACK Encoder Stream Vulnerability 🔍 Overview CVE-2026-42530 is a use-after-free vulnerability in NGINX's ngxhttpv3module. A remote unauthenticated attacker can trigger it by...

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 -...

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...

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...

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

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

CVE-2026-49457 affects erlang_quic prior to 1.4.4, where the QUIC client did not authenticate the server during TLS 1.3 handshakes. Specifically, CertificateVerify signature checks were missing, the certificate chain was not validated, and hostname verification was skipped, effectively making ver...

GO-2026-5287 Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts in github.com/traefik/traefik

Traefik's HTTP/3 TLS configuration selection is vulnerable to a bypass when using wildcard or mixed-case hosts in the SNI. The HTTP/3 QUIC path performed a direct, case-sensitive lookup on the SNI value to select the applicable TLS configuration. This lookup failed to match wildcard host patterns...

K000162871: PowerDNS DNSdist vulnerability CVE-2026-40211

Security Advisory Description An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3...