CVE-2023-26103

PoC —

CVSS 3.1

7.5 high

EPSS

1%p67

Published

Feb 25, 2023 (Feb 25, 2023)

Modified

Jun 17, 2026

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.

Vendors: deno
Products: deno
Weakness: CWE-1333
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.2%)

In the news0 stories

No ingested article mentions this CVE yet.