CVE-2023-26103
Regular Expression Denial of Service in Deno.upgradeWebSocket API
5.3
MEDIUM
CVSS 3.1
EPSS 0.66%
Description
### Impact 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. ### Patches It is recommended that users upgrade to Deno 1.31.0.
How to fix CVE-2023-26103
To remediate CVE-2023-26103, upgrade the affected package to a fixed version below.
- —upgrade to 1.31.0 or later
Is CVE-2023-26103 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 1.12.0, < 1.31.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |