engine.io-client is the client for engine.io, the implementation of a transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO
Published May 31, 2018
5.9
MEDIUMCVSS 3.0
EPSS 1.01%
Description
engine.io-client is the client for engine.io, the implementation of a transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. The vulnerability is related to the way that node.js handles the `rejectUnauthorized` setting. If the value is something that evaluates to false, certificate verification will be disabled. This is problematic as engine.io-client 1.6.8 and earlier passes in an object for settings that includes the rejectUnauthorized property, whether it has been set or not. If the value has not been explicitly changed, it will be passed in as `null`, resulting in certificate verification being turned off.
Affected products
-
- Version <= 1.6.8StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| HackerOne | Engine.io-Client Node Module | n/a |
|
- ≤ 1.6.8
No data.
No Red Hat product state for this CVE.
engine.io-client
npm
Introduced 0 Fixed 1.6.9
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | engine.io-client | 0 | 1.6.9 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.01% (0.01013) | 61.98th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.01% (0.01013) | 58.55th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.25% (0.00246) | 45.98th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.13% (0.00133) | 50.14th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.13% (0.00132) | 47.26th | v3 (v2023.03.01) |
| May 25, 2023 | 0.17% (0.00171) | 52.79th | v3 (v2023.03.01) |
| May 8, 2023 | 0.18% (0.00185) | 54.30th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.14% (0.00144) | 48.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Sep 2, 2022 | 0.95% (0.00954) | 34.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
References (6)
- https://github.com/advisories/GHSA-4r4m-hjwj-43p8 Advisory
- https://github.com/socketio/engine.io-client/commit/2c55b278a491bf45313ecc0825cf800e2f7ff5c1 x_refsource_MISCPatchThird Party Advisory
- https://nodesecurity.io/advisories/99 x_refsource_MISCThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-10536
- https://www.cigital.com/blog/node-js-socket-io/ x_refsource_MISCThird Party Advisory
- https://www.npmjs.com/advisories/99
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-4r4m-hjwj-43p8 | Advisory | |
| https://github.com/socketio/engine.io-client/commit/2c55b278a491bf45313ecc0825cf800e2f7ff5c1 | x_refsource_MISCPatchThird Party Advisory | |
| https://nodesecurity.io/advisories/99 | x_refsource_MISCThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-10536 | ||
| https://www.cigital.com/blog/node-js-socket-io/ | x_refsource_MISCThird Party Advisory | |
| https://www.npmjs.com/advisories/99 |
Change history (0)
No recorded changes yet.