HOMEVULNERABILITIESCVE-2026-59725
HIGH

CVE-2026-59725

CWE-404Published: July 8, 2026· Updated: Jul 13, 2026

7.5
CVSS v3.1
EPSS:0.35%probability of exploitation in 30 daysPercentile:27.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-59725 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

socket1 product(s)
engine.io
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671
PATCHhttps://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x

All References (3)

→
https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671Patch
→
https://github.com/socketio/socket.io/releases/tag/[email protected]Release Notes
→
https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7xPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2026-59725
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-404
CISA KEVNo
EPSS (30d)0.35%
Affected1 vendor(s)
PublishedJul 8, 2026

Related CVEs (CWE-404)

CVE-2026-1876
8.7
CVE-2026-11317
8.7
CVE-2026-1875
8.7
CVE-2026-45174
8.5
CVE-2026-2957
8.1
CVE-2026-4240
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-59725 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2026-59725·NVD