VDB
CVE-2026-59725
CVE-2026-59725
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published July 8, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| socketio | engine.io | >= 4.1.0, < 6.6.7 |
| wolfi | jupyter-base-notebook | 0 |
| chainguard | jupyter-base-notebook | 0 |
| npm | engine.io | 4.1.0 |
| chainguard | tensorflow-gpu-jupyter | * |
| chainguard | redisinsight | 0 |
| socketio | engine.io | 4.1.0 |
| socketio | socket.io | >= 4.1.0, < 6.6.7 |
Timeline
- Jul 8, 2026 CVE Published
- Jul 9, 2026 EPSS Score
- Jul 9, 2026 Coalition ESS Score
- Aug 7, 2026 EPSS Score
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 28, 2026 EPSS Score
- Aug 28, 2026 Security Advisory
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 5, 2026 EPSS Score
- Sep 6, 2026 EPSS Score
References
- https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x x_refsource_CONFIRM
- https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671 x_refsource_MISC
- https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-59725 advisory
- https://github.com/advisories/GHSA-r635-g3xr-vw7x advisory