VULNERABILITY INTELLIGENCE

CVE-2023-26103

CVSS score5.3 MEDIUM
EPSS probability1.23%
CISA KEVNot currently listed
Published2023-02-25
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Description

Versions of the package deno before 1.31.0 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the upgradeWebSocket function, which contains regexes in the form of /s*,s*/, used for splitting the Connection/Upgrade header. A specially crafted Connection/Upgrade header can be used to significantly slow down a web socket server.

Weakness classification

  • report@snyk.io: CWE-1333
  • nvd@nist.gov: CWE-1333
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-1333

Primary references