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certfr-2026-avi-1094 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquan…

certfr-2026-avi-1094

EUVD-2026-334020

fkie_cve-2026-59725

Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.

GHSA-r635-g3xr-vw7x — Socket.IO: Engine.IO Polling Transport Connection Exhaustion

Affected: npm: engine.io

### Impact

An unauthenticated remote attacker can cause a denial of service in affected versions of **engine.io** by opening Engine.IO polling sessions and sending an invalid binary `POST` request with:

``` Content-Type: application/octet-stream ```

against an Engine.IO protocol v4 polling transport.

In the vulnerable code path, the server reports a transport error but does not properly close the HTTP response associated with the malformed request. As a result, the underlying HTTP connection may remain open, consuming one server-side socket/resource per crafted request.

An attacker can repeat this with many sessions to exhaust available HTTP connections, sockets, file descriptors, or related server resources, potentially preventing legitimate clients from connecting.

### Patches

The issue was fixed in:

- **engine.io `6.6.7`**

The fix ensures that invalid binary polling `POST` requests are explicitly rejected with an HTTP response and closed properly.

Users should upgrade to:

```sh npm install engine.io@^6.6.7 ```

or a later fixed version.

If using Socket.IO through the monorepo/packages, update to a Socket.IO release that depends on a fixed `engine.io` version.

### Workarounds

If upgrading immediately is not possible, possible mitigations include:

- Block or reject polling `POST` requests with `Content-Type: application/octet-stream` for Engine.IO protocol v4 at a reverse proxy, load balancer, WAF, or application middleware. - Disable HTTP long-polling if yo…

RHSA-2026:37577 — Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

decompress: Decompress: File disclosure and corruption via arbitrary hardlink creation decompress: decompress: path traversal via indexOf containment bypass allows arbitrary file write (bypass of CVE-2020-12265 fix) socket.io: engine.io: Socket.IO: Denial of Service via invalid binary POST requests js-yaml: js-yaml: Denial of Service via crafted YAML documents