CVE•Published 2026-07-08•Modified 2026-07-13•0 articles on news•4 live references•NVD data

CVE-2026-59725Socket · Engine.io

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 72% of all CVEs

Weaknesses (CWE)

CWE-404Improper Resource Shutdown or Release

Description

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.

Timeline

Published 2026-07-08

Modified 2026-07-13

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common). Live host counts are a Premium feature.

Shodan · vuln tag

vuln:CVE-2026-59725

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Socket Engine.io"

All exposed Socket Engine.io instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Engine.io"

HTTP body or banner mentions "Engine.io" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-59725