Improper Input Validation

Engine.IO is vulnerable to Improper Input Validation. The vulnerability is due to improper validation of the WebTransport session ID, which allows an unauthenticated remote attacker to trigger a TypeError and crash the Node.js server process, causing denial of service...

EUVD-2026-42312

Socket.IO: Engine.IO WebTransport SID DoS...

GHSA-GR94-W7QR-F4J3 Socket.IO: Engine.IO WebTransport SID DoS

Impact Engine.IO servers with WebTransport enabled are vulnerable to a remotely triggerable denial of service. A malicious unauthenticated client can send a crafted WebTransport upgrade request containing a specially chosen session ID, such as proto. Because the session ID lookup did not properly...

NPM: Socket.IO: Engine.IO WebTransport SID DoS

NPM: Socket.IO: Engine.IO WebTransport SID DoS vulnerability discovered by ? in WordPress Npm engine.io versions = 6.5.0, 6.6.7...

Socket.IO: Engine.IO WebTransport SID DoS

Impact Engine.IO servers with WebTransport enabled are vulnerable to a remotely triggerable denial of service. A malicious unauthenticated client can send a crafted WebTransport upgrade request containing a specially chosen session ID, such as proto. Because the session ID lookup did not properly...

GO-2026-6099 webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules in github.com/quic-go/webtransport-go

webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules in github.com/quic-go/webtransport-go...

Apple iCloud Private Relay Can Expose Real IPs Through WebKit Proxy Bypasses

Cybersecurity researchers have disclosed a security issue with Apple's iCloud Private Relay tool that can expose a user's real IP address. Introduced with iOS 15, iCloud Private Relay employs a dual-hop architecture to ensure users' privacy by routing their Safari web traffic through two relays s...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the process that handles unknown WebTransport capsules. An attacker can cause excessive memory allocation by sending a large unknown capsule, resulting in resource exhaustion or...

GHSA-G35J-M5XG-VH3Q webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules

Summary An attacker can cause excessive memory allocation in webtransport-go by sending an unknown WebTransport capsule with a large payload. The implementation skips unknown capsules by reading the entire capsule body into memory, instead of draining it without retaining the data. This can lead ...

webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules

Summary An attacker can cause excessive memory allocation in webtransport-go by sending an unknown WebTransport capsule with a large payload. The implementation skips unknown capsules by reading the entire capsule body into memory, instead of draining it without retaining the data. This can lead ...

PT-2026-64438

Name of the Vulnerable Software and Affected Versions webtransport-go affected versions not specified Description An attacker can trigger a denial-of-service DoS by sending an unknown WebTransport capsule with a large payload. The software fails to properly handle unknown capsules by reading the...

ROS-20260717-73-0005

The vulnerability of the WebTransport component in Google Chrome browser relates to the use of memory after it is freed. Exploiting this vulnerability could allow a remote attacker to execute arbitrary code...

CVE-2026-59724

A flaw was found in Engine.IO. When Engine.IO servers have WebTransport enabled, a remote attacker can craft a session ID to resolve an inherited property of the clients object during WebTransport upgrade handling. This can lead to a TypeError, resulting in a denial of service DoS for the server...

Prototype Pollution

Overview engine.io is a realtime engine behind Socket.IO. It provides the foundation of a bidirectional connection between client and server Affected versions of this package are vulnerable to Prototype Pollution through the WebTransport upgrade handling in packages/engine.io/lib/server.ts. An...

Prototype Pollution

Overview org.webjars.npm:engine.io is a WebJar for engine.io. Affected versions of this package are vulnerable to Prototype Pollution through the WebTransport upgrade handling in packages/engine.io/lib/server.ts. An attacker can crash the server by sending a crafted unauthenticated WebTransport...

CVE-2026-59724

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as proto through an inherited property of the clients object during WebTransport upgrade handling, causing a...

CVE-2026-59724 Socket.IO: Engine.IO WebTransport SID DoS

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as proto through an inherited property of the clients object during WebTransport upgrade handling, causing a...

CVE-2026-59724 Socket.IO: Engine.IO WebTransport SID DoS

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as proto through an inherited property of the clients object during WebTransport upgrade handling, causing a...

CVE-2026-59724

Socket.IO’s Engine.IO component is affected in versions 6.5.0–6.6.6 when WebTransport is enabled. During a WebTransport upgrade, processing a crafted session ID such as proto on an inherited property of the clients object can trigger a TypeError, leading to a denial of service. The issue has been...

CVE-2026-59724 Socket.IO: Engine.IO WebTransport SID DoS

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as proto through an inherited property of the clients object during WebTransport upgrade handling, causing a...