Technology · npm
engine.io (npm) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 5 vulnerabilities in engine.io (npm): 0 in the last 7 days and 2 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-59725, was published on 8 July 2026.
- Last 7 days
- 0
- Last 90 days
- 2
- Critical, all time
- 0
- Exploited in the wild
- 0
About engine.io (npm)
The implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO.
Latest engine.io (npm) vulnerabilities
- CVE-2026-59725: Socket.IO Engine.IO connection exhaustion in polling transporthighCVSS 7.5EPSS 0.6%
- CVE-2026-59724: Socket.IO Engine.IO denial of service in WebTransport upgrade handlinghighCVSS 7.5EPSS 0.6%
- CVE-2023-31125: Socket.IO engine.io uncaught exception denial of servicelowCVSS 3.1EPSS 1.3%
- CVE-2020-36048: Socket.io engine.io resource exhaustion via POSTlowCVSS 3.1EPSS 3.2%
- CVE-2022-21676: Socket.io engine.io denial of service via uncaught exceptionlowCVSS 3.1
Most severe engine.io (npm) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-59725: Socket.IO Engine.IO connection exhaustion in polling transporthighCVSS 7.5EPSS 0.6%
- CVE-2026-59724: Socket.IO Engine.IO denial of service in WebTransport upgrade handlinghighCVSS 7.5EPSS 0.6%
- CVE-2020-36048: Socket.io engine.io resource exhaustion via POSTlowCVSS 3.1EPSS 3.2%
- CVE-2023-31125: Socket.IO engine.io uncaught exception denial of servicelowCVSS 3.1EPSS 1.3%
- CVE-2022-21676: Socket.io engine.io denial of service via uncaught exceptionlowCVSS 3.1
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 2 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/engine-io.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "engine.io (npm) vulnerabilities", https://junglewise.ai/threats/technologies/engine-io, 26 September 2026.