CVE-2026-59725

Aliases:GHSA-r635-g3xr-vw7x
Advisory lineage Upstream: 0 Downstream: 1
Downstream
RHSA-2026:37577
PUBLISHED
Published: 08 Jul 2026, 15:37
Last modified:08 Jul 2026, 17:00

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

08 Jul 2026, 15:37
Published
Vulnerability first disclosed
08 Jul 2026, 17:00
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Techniques & Countermeasures

  • CWE-404•Improper Resource Shutdown or Release

    The product does not release or incorrectly releases a resource before it is made available for re-use.

Affected Systems

  • Npm•engine.io

    ≥ 4.1.0, < 6.6.7

  • socketio•socket.io

    ≥ 4.1.0, < 6.6.7

References (5)