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TI-2022-20281 Aliases CVE-2022-41940GHSA-r7qp-cfhv-p84w

Uncaught exception in engine.io

Priority MEDIUM 64CWE-248Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
High · Low · High
Fix status
Partial Red Hat: 1 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-248.

Summary

Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. This impacts all the users of the engine.io package, including those who uses depending packages like socket.io. There is no known workaround except upgrading to a safe version. There are patches for this issue released in versions 3.6.1 and 6.2.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0211 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial engine.io (socketio): 3.6.1, 6.2.1engine.io (npm): 3.6.1, 6.2.1Red Hat: 1 advisoryRed Hat: 1 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
socketioengine.iobefore 3.6.1; 4.0.0 to before 6.2.13.6.1, 6.2.1Patch availableCNA
—engine.io (npm)before 3.6.13.6.1Patch availableGHSA-r7qp-cfhv-p84w
—engine.io (npm)4.0.0 to before 6.2.16.2.1Patch availableGHSA-r7qp-cfhv-p84w
  • engine.io Vendorsocketio Affected before 3.6.1; 4.0.0 to before 6.2.1 Fixed in 3.6.1, 6.2.1 Patch available CNA
  • engine.io (npm) Vendor— Affected before 3.6.1 Fixed in 3.6.1 Patch available GHSA-r7qp-cfhv-p84w
  • engine.io (npm) Vendor— Affected 4.0.0 to before 6.2.1 Fixed in 6.2.1 Patch available GHSA-r7qp-cfhv-p84w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:socket:engine.io:*:*:*:*:*:node.js:*:*before 3.6.1; 4.0.0 to before 6.2.1Vulnerablesocketio
  • cpe:2.3:a:socket:engine.io:*:*:*:*:*:node.js:*:* Versions before 3.6.1; 4.0.0 to before 6.2.1 Vulnerable ·socketio

Remediation

  • Fix · CNA engine.io (socketio) Fixed in 3.6.1, 6.2.1
  • Fix · GHSA-r7qp-cfhv-p84w engine.io (npm) Fixed in 3.6.1 Advisory →
  • Fix · GHSA-r7qp-cfhv-p84w engine.io (npm) Fixed in 6.2.1 Advisory →

Red Hat 1 advisory

  • RHSA-2023:3954 Released 2023-06-29 · Red Hat rating Critical
    Red Hat Fuse 7.12 release and security update
    • Red Hat Fuse 7.12

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat JBoss Data Grid 7AffectedNo fix planned: Out of support scope
Red Hat Quay 3AffectedNo fix planned: Will not fix
Red Hat Fuse 7.12Fixed RHSA-2023:3954

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-41940
  2. 2026-10-03 Alias added: GHSA-r7qp-cfhv-p84w

References

Exploit 1

Patch 2

Advisory 1

Other 1

  • TI-2022-06052 Uncaught Exception in engine.io CVSS 3.1HIGH 7.5
  • TI-2026-42594 Socket.IO: Engine.IO Polling Transport Connection Exhaustion CVSS 3.1HIGH 7.5
  • TI-2026-42593 Socket.IO: Engine.IO WebTransport SID DoS CVSS 3.1HIGH 7.5
  • TI-2020-18427 Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource… CVSS 3.1HIGH 7.5
  • TI-2023-14835 Uncaught exception in engine.io CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences