Skip to content
Fencer Vulns
high 7.3

CVE-2023-32695 json

Insufficient validation when decoding a Socket.IO packet

published 2023-05-23 3 y ago modified 2026-06-17 4 mo ago also GHSA-cqmj-92xf-r6r9 , EUVD-2023-1528

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

socket.io parser is a socket.io encoder and decoder written in JavaScript complying with version 5 of socket.io-protocol. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. A patch has been released in version 4.2.3.

Patch / fix

  • npm socket.io-parser 3.3.4, 3.4.3, 4.2.3
  • socket socket.io-parser 3.4.3, 4.2.3
  • node-socket.io-parser Debian 14, Debian 13, Debian 12 4.2.1+~3.1.0-2

debian advisories DEBIAN-CVE-2023-32695

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
npm socket.io-parser
>=4.0.4, <4.2.3
>=3.4.0, <3.4.3
<3.3.4
4.2.3
3.4.3
3.3.4

Affected products

  • socketio socket.io-parser

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.