Skip to content
Fencer Vulns
high 7.5

CVE-2020-36049 json

Resource exhaustion in socket.io-parser

published 2021-01-07 5 y ago modified 2026-06-17 4 mo ago also GHSA-xfhh-g9f5-x4m4 , EUVD-2021-1424

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

socket.io-parser before 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation approach is used.

Patch / fix

  • npm socket.io-parser 3.3.2, 3.4.1
  • socket socket.io-parser 3.4.1
  • node-socket.io-parser Debian 14, Debian 13, Debian 12 3.4.1-1

debian advisories DEBIAN-CVE-2020-36049

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-36049 updated cvss 7.5

yarnpkg-socket.io-parser: a denial of service (memory consumption) via a large packet because a concatenation approach is used

  • Red Hat 3scale API Management Platform 2 system
    affected: no fix available
  • Red Hat Quay 3 quay/quay-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Quay 3 quay/quay-builder-qemu-rhcos-rhel8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.67% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.caller.xyz https://blog.caller.xyz/socketio-engineio-dos/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm socket.io-parser
<3.3.2
>=3.4.0, <3.4.1
3.3.2
3.4.1

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-400 Uncontrolled Resource Consumption

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.