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Vulnerabilities

Vulnerability · CVE-2026-59725

Socket.IO enables bidirectional and low-latency communication for every platform.

Published Jul 8, 2026 · catalog updated Oct 14, 2026 · Socket.IO enables bidirectional and

Check if you run it

No confirmed exploitation is on record for CVE-2026-59725. EPSS is 0.64%. Act only if a listed version of Socket.IO enables bidirectional and is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Socket.IO enables bidirectional and).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.64%
Remediation
Advisory link
Affected products
cpe socket/engine.io

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe socket/engine.ioversion unspecified

How to fix CVE-2026-59725

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-59725. EPSS is 0.64%. Act only if a listed version of Socket.IO enables bidirectional and is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-404. EPSS 0.64%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 8, 2026 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-59725

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-59725

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-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 u

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.