JLSEC-2026-249 Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when...

Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in...

SUSE CVE-2025-64763

Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, when Envoy is configured in TCP proxy mode to handle CONNECT requests, it accepts client data before issuing a 2xx response and forwards that data to the upstream TCP connection. If a forwardi...

CVE-2025-64763

A flaw was found in Envoy. This vulnerability allows a de-synchronized CONNECT tunnel state via accepting client data before issuing a 2xx response and forwarding it to the upstream TCP Transmission Control Protocol connection when configured in TCP Transmission Control Protocol proxy mode to...

BIT-ENVOY-2025-64763 Envoy forwards early CONNECT data in TCP proxy mode

Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, when Envoy is configured in TCP proxy mode to handle CONNECT requests, it accepts client data before issuing a 2xx response and forwards that data to the upstream TCP connection. If a forwardi...

EUVD-2025-201099

Envoy forwards early CONNECT data in TCP proxy mode...

CVE-2025-64763 Envoy forwards early CONNECT data in TCP proxy mode

Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, when Envoy is configured in TCP proxy mode to handle CONNECT requests, it accepts client data before issuing a 2xx response and forwards that data to the upstream TCP connection. If a forwardi...

CVE-2025-64763

Envoy CVE-2025-64763 relates to a de-synchronization risk in TCP proxy mode where Envoy may accept client data for CONNECT requests before sending a 2xx response, and then forward that data to the upstream connection. If the upstream proxy returns a non‑2xx status, the CONNECT tunnel state can be...

CVE-2025-64763 Envoy forwards early CONNECT data in TCP proxy mode

Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, when Envoy is configured in TCP proxy mode to handle CONNECT requests, it accepts client data before issuing a 2xx response and forwards that data to the upstream TCP connection. If a forwardi...

CVE-2024-45397

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by...

Lightning-Fast Requests with Early Data

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DEBIAN-CVE-2024-45397

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by...

CVE-2024-45397

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by...

PT-2024-31601 · H2O +1 · H2O +1

Name of the Vulnerable Software and Affected Versions: h2o affected versions not specified Description: The issue concerns an HTTP server that supports various HTTP versions. When specific conditions are met, such as receiving an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QU...

FreeBSD : traefik -- Bypassing IP allow-lists via HTTP/3 early data requests (767dfb2d-3c9e-11ef-a829-5404a68ad561)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 767dfb2d-3c9e-11ef-a829-5404a68ad561 advisory. The traefik authors report: There is a vulnerability in Traefik that allows bypassing IP allow-lists vi...

traefik -- Bypassing IP allow-lists via HTTP/3 early data requests

The traefik authors report: There is a vulnerability in Traefik that allows bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes sent with spoofed IP addresses...

OESA-2024-1531 openssl security update

The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, fully featured, and Open Source toolkit implementing the Secure Sockets Layer SSL v2/v3 and Transport Layer Security TLS v1 protocols as well as a full-strength general purpose cryptography library. The project i...

ALPINE-CVE-2024-2511

Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in...

[SECURITY] Fedora 39 Update: fizz-2023.10.16.00-1.fc39

Fizz is a TLS 1.3 implementation. Fizz currently supports TLS 1.3 drafts 28, 26 both wire-compatible with the final specification, and 23. All major handshake modes are supported, includ ing PSK resumption, early data, client authentication, and HelloRetryRequest...

[SECURITY] Fedora 38 Update: fizz-2023.10.16.00-1.fc38

Fizz is a TLS 1.3 implementation. Fizz currently supports TLS 1.3 drafts 28, 26 both wire-compatible with the final specification, and 23. All major handshake modes are supported, includ ing PSK resumption, early data, client authentication, and HelloRetryRequest...

[SECURITY] Fedora 37 Update: fizz-2023.10.16.00-1.fc37

Fizz is a TLS 1.3 implementation. Fizz currently supports TLS 1.3 drafts 28, 26 both wire-compatible with the final specification, and 23. All major handshake modes are supported, includ ing PSK resumption, early data, client authentication, and HelloRetryRequest...