CVE-2026-69185
highpriority · track · 0EPSS 0.006 · 50 %ileEUUSEPSS · scored 2026-10-28
Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (6)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-2m8v-j782-fhvrSocket.IO: Zero-attachment Memory Exhaustion2026-08-03ghsa · osvUS
### Impact A specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. ### Patches | Version range | Used by | Fixed version | |------------------|--------------------------------------------|---------------| | `>=4.0.0 <4.2.7` | `socket.io@4.x` and `socket.io-client@4.x` | `4.2.7` | | `>=3.4.0 <3.4.5` | `socket.io@2.x` | `3.4.5` | | `<3.3.6` | `socket.io-client@2.x` | `3.3.6` | ### Workarounds There is no known workaround except upgrading to a safe version. ### For more information If you have any questions or comments about this advisory: - Open a discussion [here](https://github.com/socketio/socket.io/discussions)
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4cnnvd
- https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240cnnvd
- https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291cnnvd
- https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvrcnnvd
- https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4enisa_euvd
- https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240enisa_euvd
- https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291enisa_euvd
- https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvrenisa_euvd
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