Incorrect handling of Upgrade header with the value websocket leads in crashing of containers hosting sockjs apps. This affects the package sockjs before 0.3.20.
https://github.com/sockjs/sockjs-node/pull/265
https://github.com/sockjs/sockjs-node/commit/dd7e642cd69ee74385825816d30642c43e051d16
https://snyk.io/vuln/SNYK-JS-SOCKJS-575261
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-575448
https://github.com/sockjs/sockjs-node/issues/252
https://github.com/andsnw/sockjs-dos-py
Source: Mitre, NVD
Published: 2020-07-09
Updated: 2026-06-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.15951